title: National debt of the United States

text: Debt levels may affect economic growth rates. In 2010, economists Kenneth Rogoff and Carmen Reinhart reported that among the 20 developed countries studied, average annual GDP growth was 3–4% when debt was relatively moderate or low (i.e., under 60% of GDP), but it dips to just 1.6% when debt was high (i.e., above 90% of GDP). In April 2013, the conclusions of Rogoff and Reinhart's study came into question when a coding error in their original paper was discovered by Herndon, Ash and Pollin of the University of Massachusetts Amherst. Herndon, Ash and Pollin found that after correcting for errors and unorthodox methods used, there was no evidence that debt above a specific threshold reduces growth. Reinhart and Rogoff maintain that after correcting for errors, a negative relationship between high debt and growth remains. However, other economists, including Paul Krugman, have argued that it is low growth which causes national debt to increase, rather than the other way around.


title: National debt of the United States

text: Commenting on fiscal sustainability, former Federal Reserve Chairman Ben Bernanke stated in April 2010 that "Neither experience nor economic theory clearly indicates the threshold at which government debt begins to endanger prosperity and economic stability. But given the significant costs and risks associated with a rapidly rising federal debt, our nation should soon put in place a credible plan for reducing deficits to sustainable levels over time."


title: National debt of the United States

text: Despite rising debt levels, interest costs have remained at approximately 2008 levels (around $450 billion in total) because of lower than long-term interest rates paid on government debt in recent years. The federal debt at the end of the 2018/19 fiscal year (ended September 30, 2019) was $22.7 trillion. The portion that is held by the public was $16.8 trillion. Neither figure includes approximately $2.5 trillion owed to the government. Interest on the debt was $404 billion.


title: National debt of the United States

text: The cost of servicing the U.S. national debt can be measured in various ways. The CBO analyzes net interest as a percentage of GDP, with a higher percentage indicating a higher interest payment burden. During 2015, this was 1.3% GDP, close to the record low 1.2% of the 1966–1968 era. The average from 1966 to 2015 was 2.0% of GDP. However, the CBO estimated in 2016 that the interest amounts and % GDP will increase significantly over the following decade as both interest rates and debt levels rise: "Interest payments on that debt represent a large and rapidly growing expense of the federal government. CBO's baseline shows net interest payments more than tripling under current law, climbing from $231 billion in 2014, or 1.3% of GDP, to $799 billion in 2024, or 3.0% of GDP—the highest ratio since 1996."


title: National debt of the United States

text: According to a study by the Committee for a Responsible Federal Budget (CRFB), the U.S. government will spend more on servicing their debts than they do for their national defense budget by 2024.


title: National debt of the United States

text: Economists also debate the definition of public debt. Krugman argued in May 2010 that the debt held by the public is the right measure to use, while Reinhart has testified to the President's Fiscal Reform Commission that gross debt is the appropriate measure. The Center on Budget and Policy Priorities (CBPP) cited research by several economists supporting the use of the lower debt held by the public figure as a more accurate measure of the debt burden, disagreeing with these Commission members.


title: National debt of the United States

text: There is debate regarding the economic nature of the intragovernmental debt, which was approximately $4.6 trillion in February 2011. For example, the CBPP argues: that "large increases in [debt held by the public] can also push up interest rates and increase the amount of future interest payments the federal government must make to lenders outside of the United States, which reduces Americans' income. By contrast, intragovernmental debt (the other component of the gross debt) has no such effects because it is simply money the federal government owes (and pays interest on) to itself." However, if the U.S. government continues to run "on budget" deficits as projected by the CBO and OMB for the foreseeable future, it will have to issue marketable Treasury bills and bonds (i.e., debt held by the public) to pay for the projected shortfall in the Social Security program. This will result in "debt held by the public" replacing "intragovernmental debt".


title: National debt of the United States

text: One debate about the national debt relates to intergenerational equity. For example, if one generation is receiving the benefit of government programs or employment enabled by deficit spending and debt accumulation, to what extent does the resulting higher debt impose risks and costs on future generations? There are several factors to consider:


title: National debt of the United States

text: Krugman wrote in March 2013 that by neglecting public investment and failing to create jobs, we are doing far more harm to future generations than merely passing along debt: "Fiscal policy is, indeed, a moral issue, and we should be ashamed of what we're doing to the next generation's economic prospects. But our sin involves investing too little, not borrowing too much." Young workers face high unemployment and studies have shown their income may lag throughout their careers as a result. Teacher jobs have been cut, which could affect the quality of education and competitiveness of younger Americans.


title: National debt of the United States

text: The U.S. has never fully defaulted. In April 1979, however, the U.S. may have technically defaulted on $122 million in Treasury bills, which was less than 1% of U.S. debt. The Treasury Department characterized it as a delay rather than as a default, but it did have consequences for short-term interest rates, which jumped 0.6%. Others view it as a temporary, partial default.


title: National debt of the United States

text: The COVID-19 pandemic in the United States impacted the economy significantly beginning in March 2020, as businesses were shut-down and furloughed or fired personnel. About 16 million persons filed for unemployment insurance in the three weeks ending April 9. It caused the number of unemployed persons to increase significantly, which is expected to reduce tax revenues while increasing automatic stabilizer spending for unemployment insurance and nutritional support. As a result of the adverse economic impact, both state and federal budget deficits will dramatically increase, even before considering any new legislation.


title: National debt of the United States

text: To help address lost income for millions of workers and assist businesses, Congress and President Trump enacted the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) on March 27, 2020. It included loans and grants for businesses, along with direct payments to individuals and additional funding for unemployment insurance. While the act carried an estimated $2.3 trillion price tag, some or all of the loans may ultimately be paid back including interest, while the spending measures should dampen the negative budgetary impact of the economic disruption. While the law will almost certainly increase budget deficits relative to the January 2020 10-year CBO baseline (completed prior to the COVID-19 pandemic), in the absence of the legislation, a complete economic collapse could have occurred.


title: National debt of the United States

text: CBO provided a preliminary score for the CARES Act on April 16, 2020, estimating that it would increase federal deficits by about $1.8 trillion over the 2020-2030 period. The estimate includes:


title: National debt of the United States

text: CBO reported that not all parts of the bill will increase deficits: “Although the act provides financial assistance totaling more than $2 trillion, the projected cost is less than that because some of that assistance is in the form of loan guarantees, which are not estimated to have a net effect on the budget. In particular, the act authorizes the Secretary of the Treasury to provide up to $454 billion to fund emergency lending facilities established by the Board of Governors of the Federal Reserve System. Because the income and costs stemming from that lending are expected to roughly offset each other, CBO estimates no deficit effect from that provision.”


title: National debt of the United States

text: The Committee for a Responsible Federal Budget estimated that the budget deficit for fiscal year 2020 would increase to a record $3.8 trillion, or 18.7% GDP. For scale, in 2009 the budget deficit reached 9.8% GDP ($1.4 trillion nominal dollars) in the depths of the Great Recession. CBO forecast in January 2020 that the budget deficit in FY2020 would be $1.0 trillion, prior to considering the impact of the COVID-19 pandemic or CARES. CFRB further estimated that the national debt would reach 106% of U.S. GDP in September 2020, a record since the aftermath of World War II.


title: National debt of the United States

text: President Biden has spent significant amounts of money towards relief of the COVID-19 pandemic. According to a May 2021 report, Biden has or plans to spend $5.72 trillion dollars toward this effort and others such as climate change including providing stimulus checks and serving schools and low-income children. Many economists have agreed that this unprecedented level of spending from the Biden Administration has, in part, contributed to the inflation surge of 2021 and 2022 as a result of increasing the money supply in the economy.


title: National debt of the United States

text: Note that this is all interest the U.S. paid, including interest credited to Social Security and other government trust funds, not just "interest on debt" frequently cited elsewhere.


title: National debt of the United States

text: The following is a list of the top foreign holders of Treasury securities as listed by the Federal Reserve Board (revised by October 2022 survey):


title: National debt of the United States

text: A 1998 Brookings Institution study published by the Nuclear Weapons Cost Study Committee (formed in 1993 by the W. Alton Jones Foundation), calculated that total expenditures for U.S. nuclear weapons from 1940 to 1998 was $5.5 trillion in 1996 Dollars. The total public debt at the end of fiscal year 1998 was $5,478,189,000,000 in 1998 Dollars or $5.3 trillion in 1996 Dollars.


title: National debt of the United States

text: Sources: Eurostat, International Monetary Fund, "World Economic Outlook" (emerging market economies); Organisation for Economic Co-operation and Development, "Economic Outlook" (advanced economies)IMF,


title: National debt of the United States

text: Afghanistan, Armenia, Australia, Azerbaijan, Bangladesh, Bhutan, Brunei Darussalam, Cambodia, China, People's Republic of, Fiji, Georgia, Hong Kong SAR, India, Indonesia, Japan, Kazakhstan, Kiribati, Korea, Republic of, Kyrgyz Republic, Lao P.D.R., Macao SAR, Malaysia, Maldives, Marshall Islands, Micronesia, Fed. States of, Mongolia, Myanmar, Nauru, Nepal, New Zealand, Pakistan, Palau, Papua New Guinea, Philippines, Samoa, Singapore, Solomon Islands, Sri Lanka, Taiwan, Tajikistan, Thailand, Timor-Leste, Tonga, Turkey, Turkmenistan, Tuvalu, Uzbekistan, Vanuatu, Vietnam


title: National debt of the United States

text: U.S. states have a combined state and local government debt of about $3 trillion and another $5 trillion in unfunded liabilities.


title: River

text: A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague.


title: River

text: Rivers are part of the water cycle. Water generally collects in a river from precipitation through a drainage basin from surface runoff and other sources such as groundwater recharge, springs, and the release of stored water in natural ice and snowpacks.


title: River

text: Rivers are often considered major features within a landscape; however, they actually only cover around 0.1% of the land on Earth. They are made more obvious and significant to humans since many human cities and civilizations are built around the freshwater supplied by rivers and streams. Most of the major cities of the world are situated on the banks of rivers, as they are, or were, used as a source of water, for obtaining food, for transport, as borders, as a defensive measure, as a source of hydropower to drive machinery, for bathing, and as a means of disposing of waste. In the pre-industrial era, larger rivers were a major obstruction to the movement of people, goods, and armies across them. Towns often developed at the few locations they could be crossed. Many major cities such as London are located at the lowest point at which a river could be bridged.


title: River

text: Potamology is the scientific study of rivers, while limnology is the study of inland waters in general.


title: River

text: A river begins at a source (or more often several sources) which is usually a watershed, drains all the streams in its drainage basin, follows a watercourse, and ends either at a mouth or mouths which could be a confluence, river delta, etc. The water in a river is usually confined to a channel, made up of a stream bed between banks. In larger rivers there is often also a wider floodplain shaped by flood-waters over-topping the channel. Floodplains may be very wide in relation to the size of the river channel. This distinction between river channel and floodplain can be blurred, especially in urban areas where the floodplain of a river channel can become greatly developed by housing and industry.


title: River

text: The term upriver (or upstream) refers to the direction towards the source of the river, i.e. against the direction of flow. Likewise, the term downriver (or downstream) describes the direction towards the mouth of the river, in which the current flows. The term left bank refers to the left bank in the direction of flow, right bank to the right in the direction of flow.


title: River

text: Rivers can flow down mountains, through valleys or along plains, and can create canyons or gorges. The river channel typically contains a single stream, but some rivers flow as several interconnecting streams, producing a braided river. Braided rivers occur on peneplains and some of the larger river deltas. Anastamosing rivers are similar to braided rivers and are quite rare; they have multiple sinuous channel - 1 carrying large volumes of sediment. There are rare cases of river bifurcation in which a river divides, and the resultant flows end in different seas. An example is the Nerodime River in Kosovo.


title: River

text: A river flowing in its channel is a source of energy that acts on the river channel to change its shape and form. In 1757, German hydrologist Albert Brahms empirically observed that the submerged weight of objects that may be carried away by a river is proportional to the sixth power of the river flow speed. This formulation is also sometimes called Airy's law. Thus, if the speed of flow is doubled, the flow would dislodge objects with 64 times as much submerged weight. In mountainous torrential zones, this can be seen as erosion channels through hard rocks and the creation of sands and gravels from the destruction of larger rocks. A river valley that was created from a U-shaped glaciated valley can often easily be identified by the V-shaped channel that it has carved.


title: River

text: In the middle reaches where a river flows over flatter land, meanders may form through erosion of the river banks and deposition on the inside of bends. Sometimes the river will cut off a loop, shortening the channel and forming an oxbow lake or billabong. Rivers that carry large amounts of sediment may develop conspicuous deltas at their mouths. Rivers whose mouths are in saline tidal waters may form estuaries.


title: River

text: Throughout the course of the river, the total volume of water transported downstream will often be a combination of the free water flow together with a substantial volume flowing through sub-surface rocks and gravels that underlie the river and its floodplain (called the hyporheic zone). For many rivers in large valleys, this unseen component of flow may greatly exceed the visible flow.


title: River

text: Rivers have been classified by many criteria including their topography, their biotic status, and their relevance to white water rafting or canoeing activities.


title: River

text: Most but not all rivers flow on the surface. Subterranean rivers flow underground in caves. Such rivers are frequently found in regions with limestone geologic formations. Subglacial streams are the braided rivers that flow at the beds of glaciers and ice sheets, permitting meltwater to be discharged at the front of the glacier. Because of the gradient in pressure from the overlying weight of the glacier, such streams can even flow uphill.


title: River

text: An intermittent river (or ephemeral river) only flows occasionally and can be dry for several years at a time. These rivers are found in regions with limited or highly variable rainfall, or can occur because of geologic conditions such as a highly permeable river bed. Some ephemeral rivers flow during the summer months but not in the winter. Such rivers are typically fed from chalk aquifers which recharge from winter rainfall. In England these rivers are called "bournes" and give their name to places such as Bournemouth and Eastbourne. Even in humid regions, the location where flow begins in the smallest tributary streams generally moves upstream in response to precipitation and downstream in its absence or when active summer vegetation diverts water for evapotranspiration. Normally dry rivers in arid zones are often identified as arroyos or other regional names.


title: River

text: The meltwater from large hailstorms can create a slurry of water, hail and sand or soil, forming temporary rivers.


title: River

text: The Strahler Stream Order ranks rivers based on the connectivity and hierarchy of contributing tributaries. Headwaters are first order while the Amazon River is twelfth order. Approximately 80% of the rivers in the world are of the first and second order.


title: River

text: The ways in which a river's characteristics vary between its upper and lower course are summarized by the Bradshaw model. Power-law relationships between channel slope, depth, and width are given as a function of discharge by "river regime".


title: River

text: In certain languages, distinctions are made among rivers based on their stream order. In French, for example, rivers that run to the sea are called "fleuve", while other rivers are called "rivière". For example, in Canada, the Churchill River in Manitoba is called "la rivière Churchill" as it runs to Hudson Bay, but the Churchill River in Labrador is called "le fleuve Churchill" as it runs to the Atlantic Ocean. As most rivers in France are known by their names only without the word "rivière" or "fleuve" (e.g. "la Seine", not "le fleuve Seine", even though the Seine is classed as a "fleuve"), one of the most prominent rivers in the Francophone commonly known as "fleuve" is "le fleuve Saint-Laurent" (the St. Lawrence River). Since many "fleuves" are large and prominent, receiving many tributaries, the word is sometimes used to refer to certain large rivers that flow into other "fleuves"; however, even small streams that run to the sea are called "fleuve" (e.g. "", "coastal "fleuve"").


title: River

text: Rivers can generally be classified as either alluvial, bedrock, or some mix of the two. Alluvial rivers have channels and floodplains that are self-formed in unconsolidated or weakly consolidated sediments. They erode their banks and deposit material on bars and their floodplains.


title: River

text: Bedrock rivers form when the river downcuts through the modern sediments and into the underlying bedrock. This occurs in regions that have experienced some kind of uplift (thereby steepening river gradients) or in which a particularly hard lithology causes a river to have a steepened reach that has not been covered in modern alluvium. Bedrock rivers very often contain alluvium on their beds; this material is important in eroding and sculpting the channel. Rivers that go through patches of bedrock and patches of deep alluvial cover are classified as mixed bedrock-alluvial.


title: River

text: Alluvial rivers can be further classified by their channel pattern as meandering, braided, wandering, anastomose, or straight. The morphology of an alluvial river reach is controlled by a combination of sediment supply, substrate composition, discharge, vegetation, and bed aggradation.


title: River

text: There are several systems of classification based on ecological conditions typically assigning classes from the most oligotrophic or unpolluted through to the most eutrophic or polluted. Other systems are based on a whole eco-system approach such as developed by the New Zealand Ministry for the Environment. In Europe, the requirements of the Water Framework Directive has led to the development of a wide range of classification methods including classifications based on fishery status


title: River

text: The international scale of river difficulty is used to rate the challenges of navigation—particularly those with rapids. Class I is the easiest and Class VI is the hardest.


title: River

text: Rivers flow downhill with their power derived from gravity. A common misconception holds that all or most rivers flow from north to south, but this is not so: rivers flow in all directions of the compass and often have complex meandering paths.


title: River

text: Rivers flowing downhill, from river source to river mouth, do not necessarily take the shortest path. For alluvial streams, straight and braided rivers have very low sinuosity and flow directly down hill, while meandering rivers flow from side to side across a valley. Bedrock rivers typically flow in either a fractal pattern, or a pattern that is determined by weaknesses in the bedrock, such as faults, fractures, or more erodible layers.


title: River

text: Volumetric flow rate, also known as discharge, volume flow rate, and rate of water flow, is the volume of water which passes through a given cross-section of the river channel per unit time. It is typically measured in cubic metres per second (cumec) or cubic feet per second (cfs).


title: River

text: Volumetric flow rate can be thought of as the mean velocity of the flow through a given cross-section, times that cross-sectional area. Mean velocity can be approximated through the use of the law of the wall. In general, velocity increases with the depth (or hydraulic radius) and slope of the river channel, while the cross-sectional area scales with the depth and the width: the double-counting of depth shows the importance of this variable in determining the discharge through the channel.


title: River

text: In its youthful stage, a river causes erosion in the watercourse, deepening the valley. Hydraulic action loosens and dislodges aggregate which further erodes the banks and the river bed. Over time, this deepens the river bed and creates steeper sides which are then weathered. The steepened nature of the banks causes the sides of the valley to move downslope causing the valley to become V-shaped.


title: River

text: Waterfalls also form in the youthful river valley where a band of hard rock overlays a layer of soft rock. Differential erosion occurs as the river erodes the soft rock more readily than the hard rock, this leaves the hard rock more elevated and stands out from the river below. A plunge pool forms at the bottom and deepens as a result of hydraulic action and abrasion.


title: River

text: Flooding is a natural part of a river's cycle. The majority of the erosion of river channels and the erosion and deposition on the associated floodplains occur during the flood stage. In many developed areas, human activity has changed the form of river channels, altering magnitudes and frequencies of flooding. Some examples of this are the building of levees, the straightening of channels, and the draining of natural wetlands.


title: River

text: In many cases human activities in rivers and floodplains have dramatically increased the risk of flooding. Straightening rivers allows water to flow more rapidly downstream, increasing the risk of flooding places further downstream. Building on flood plains removes flood storage, which again exacerbates downstream flooding. The building of levees only protects the area behind the levees and not those further downstream. Levees and flood-banks can also increase flooding upstream because of the back-water pressure as the river flow is impeded by the narrow channel banks. Detention basins finally also reduce the risk of flooding significantly by being able to take up some of the flood water.


title: River

text: Sediment yield is the total quantity of particulate matter (suspended or bedload) reaching the outlet of a drainage basin over a fixed time frame. Yield is usually expressed as kilograms per square kilometre per year. Sediment delivery processes are affected by a myriad of factors such as drainage area size, basin slope, climate, sediment type (lithology), vegetation cover, and human land use / management practices.


title: River

text: The theoretical concept of the 'sediment delivery ratio' (ratio between yield and total amount of sediment eroded) indicates that not all of the sediment is eroded within a certain catchment that reaches out to the outlet (e.g., deposition on floodplains). Such storage opportunities are typically increased in catchments of larger size, thus leading to a lower yield and sediment delivery ratio.


title: River

text: Brackish water occurs in most rivers where they meet the sea. The extent of brackish water may extend a significant distance upstream, especially in areas with high tidal ranges.


title: River

text: The organisms in the riparian zone respond to changes in river channel location and patterns of flow. The ecosystem of rivers is generally described by the river continuum concept, which has some additions and refinements to allow for dams and waterfalls and temporary extensive flooding. The concept describes the river as a system in which the physical parameters, the availability of food particles and the composition of the ecosystem are continuously changing along its length. The food (energy) that remains from the upstream part is used downstream.


title: River

text: The general pattern is that the first order streams contain particulate matter (decaying leaves from the surrounding forests) which is processed there by shredders like Plecoptera larvae. The products of these shredders are used by collectors, such as Hydropsychidae, and further downstream algae that create the primary production become the main food source of the organisms. All changes are gradual and the distribution of each species can be described as a normal curve, with the highest density where the conditions are optimal. In rivers succession is virtually absent and the composition of the ecosystem stays fixed.


title: River

text: The chemistry of rivers is complex and depends on inputs from the atmosphere, the geology through which it travels and the inputs from man's activities. The chemical composition of the water has a large impact on the ecology of that water for both plants and animals and it also affects the uses that may be made of the river water. Understanding and characterizing river water chemistry requires a well designed and managed sampling and analysis.


title: River

text: The coarse sediments, gravel, and sand, generated and moved by rivers are extensively used in construction. In parts of the world this can generate extensive new lake habitats as gravel pits fill with water. In other circumstances it can destabilize the river bed, and the course of the river and cause severe damage to spawning fish populations which rely on stable gravel formations for egg laying. In upland rivers, rapids with whitewater or even waterfalls occur. Rapids are often used for recreation, such as whitewater kayaking.


title: River

text: Fast flowing rivers and waterfalls are widely used as sources of energy, via watermills and hydroelectric plants. Evidence of watermills shows them in use for many hundreds of years, for instance in Orkney at Dounby Click Mill. Prior to the invention of steam power, watermills for grinding cereals and for processing wool and other textiles were common across Europe. In the 1890s the first machines to generate power from river water were established at places such as Cragside in Northumberland and in recent decades there has been a significant increase in the development of large scale power generation from water, especially in wet mountainous regions such as Norway.


title: River

text: Rivers have been a source of food since pre-history. They are often a rich source of fish and other edible aquatic life and are a major source of fresh water, which can be used for drinking and irrigation. Rivers help to determine the urban form of cities and neighborhoods, and their corridors often present opportunities for urban renewal through the development of foreshoreways such as river walks. Rivers also provide an easy means of disposing of wastewater and, in much of the less developed world, other wastes.


title: River

text: Rivers have been used for navigation for thousands of years. The earliest evidence of navigation is found in the Indus Valley civilization, which existed in northwestern India around 3300 BC. Riverine navigation provides a cheap means of transport and is still used extensively on most major rivers of the world like the Amazon, the Ganges, the Nile, the Mississippi, and the Indus.


title: River

text: In some heavily forested regions such as Scandinavia and Canada, lumberjacks use rivers to float felled trees downstream to lumber camps for further processing, saving much effort and cost by transporting the huge heavy logs by natural means.


title: River

text: Rivers have been important in determining political boundaries and defending countries. For example, the Danube was a long-standing border of the Roman Empire, and today it forms most of the border between Bulgaria and Romania. The Mississippi in North America and the Rhine in Europe are major east–west boundaries in those continents. The Orange and Limpopo Rivers in southern Africa form the boundaries between provinces and countries along their routes.


title: River

text: Sacred rivers and their reverence is a phenomenon found in several religions, especially religions in which nature is revered. For example, the Indian-origin religions of Buddhism, Hinduism, Jainism, and Sikhism revere and preserve groves, forests, trees, mountains and rivers as sacred. Among the most sacred rivers in Hinduism are the Ganges, Yamuna, and Sarasvati rivers. Other sacred rivers for Indian religions include the Rigvedic rivers, the Narmada, the Godavari, and the Kaveri rivers. The Vedas and Gita, the most sacred of Hindu texts, were written on the banks of the Sarasvati river.


title: River

text: Rivers are often managed or controlled to make them more useful or less disruptive to human activity.


title: River

text: River management is a continuous activity as rivers tend to 'undo' the modifications made by people. Dredged channels silt up, sluice mechanisms deteriorate with age, levees and dams may suffer seepage or catastrophic failure. The benefits sought through managing rivers may often be offset by the social and economic costs of mitigating the bad effects of such management. As an example, in parts of the developed world, rivers have been confined within channels to free up flat flood-plain land for development. Floods can inundate such development at high financial cost and often with loss of life.


title: River

text: Rivers are increasingly managed for habitat conservation, as they are critical for many aquatic and riparian plants, resident and migratory fishes, waterfowl, birds of prey, migrating birds, and many mammals.


title: River

text: Man-made causes, such as the over-exploitation and pollution, are the biggest threats and concerns which are making rivers ecologically dead and drying up the rivers.


title: River

text: Plastic pollution imposes threats on aquatic life and river ecosystems because of plastic's durability in the natural environment. Plastic debris may result in entanglement and ingestion by aquatic life such as turtles, birds, and fish, causing severe injury and death. Human livelihoods around rivers are also impacted by plastic pollution through direct damage to shipping and transport vessels, effects on tourism or real estate value, and the clogging of drains and other hydraulic infrastructure leading to increased flood risk.


title: Graffiti

text: Graffiti (plural; singular graffiti or graffito, the latter rarely used except in archeology) is art that is written, painted or drawn on a wall or other surface, usually without permission and within public view. Graffiti ranges from simple written words to elaborate wall paintings, and has existed since ancient times, with examples dating back to ancient Egypt, ancient Greece, and the Roman Empire.


title: Graffiti

text: Graffiti is a controversial subject. In most countries, marking or painting property without permission is considered by property owners and civic authorities as defacement and vandalism, which is a punishable crime, citing the use of graffiti by street gangs to mark territory or to serve as an indicator of gang-related activities. Graffiti has become visualized as a growing urban "problem" for many cities in industrialized nations, spreading from the New York City subway system and Philadelphia in the early 1970s to the rest of the United States and Europe and other world regions.


title: Graffiti

text: "Graffiti" (usually both singular and plural) and the rare singular form "graffito" are from the Italian word "graffiato" ("scratched"). The term "graffiti" is used in art history for works of art produced by scratching a design into a surface. A related term is "sgraffito", which involves scratching through one layer of pigment to reveal another beneath it. This technique was primarily used by potters who would glaze their wares and then scratch a design into it. In ancient times graffiti were carved on walls with a sharp object, although sometimes chalk or coal were used. The word originates from Greek —"graphein"—meaning "to write".


title: Graffiti

text: The term "graffiti" originally referred to the inscriptions, figure drawings, and such, found on the walls of ancient sepulchres or ruins, as in the Catacombs of Rome or at Pompeii. Use of the word has evolved to include any graphics applied to surfaces in a manner that constitutes vandalism.


title: Graffiti

text: The only known source of the Safaitic language, an ancient form of Arabic, is from graffiti: inscriptions scratched on to the surface of rocks and boulders in the predominantly basalt desert of southern Syria, eastern Jordan and northern Saudi Arabia. Safaitic dates from the first century BC to the fourth century AD.


title: Graffiti

text: The first known example of "modern style" graffiti survives in the ancient Greek city of Ephesus (in modern-day Turkey). Local guides say it is an advertisement for prostitution. Located near a mosaic and stone walkway, the graffiti shows a handprint that vaguely resembles a heart, along with a footprint, a number, and a carved image of a woman's head.


title: Graffiti

text: The ancient Romans carved graffiti on walls and monuments, examples of which also survive in Egypt. Graffiti in the classical world had different connotations than they carry in today's society concerning content. Ancient graffiti displayed phrases of love declarations, political rhetoric, and simple words of thought, compared to today's popular messages of social and political ideals.


title: Graffiti

text: The eruption of Vesuvius preserved graffiti in Pompeii, which includes Latin curses, magic spells, declarations of love, insults, alphabets, political slogans, and famous literary quotes, providing insight into ancient Roman street life. One inscription gives the address of a woman named Novellia Primigenia of Nuceria, a prostitute, apparently of great beauty, whose services were much in demand. Another shows a phallus accompanied by the text, "mansueta tene" ("handle with care").


title: Graffiti

text: Ancient tourists visiting the 5th-century citadel at Sigiriya in Sri Lanka scribbled over 1800 individual graffiti there between the 6th and 18th centuries. Etched on the surface of the Mirror Wall, they contain pieces of prose, poetry, and commentary. The majority of these visitors appear to have been from the elite of society: royalty, officials, professions, and clergy. There were also soldiers, archers, and even some metalworkers. The topics range from love to satire, curses, wit, and lament. Many demonstrate a very high level of literacy and a deep appreciation of art and poetry. Most of the graffiti refer to the frescoes of semi-nude females found there. One reads:


title: Graffiti

text: Among the ancient political graffiti examples were Arab satirist poems. Yazid al-Himyari, an Umayyad Arab and Persian poet, was most known for writing his political poetry on the walls between Sajistan and Basra, manifesting a strong hatred towards the Umayyad regime and its "walis", and people used to read and circulate them very widely.


title: Graffiti

text: Historic forms of graffiti have helped gain understanding into the lifestyles and languages of past cultures. Errors in spelling and grammar in these graffiti offer insight into the degree of literacy in Roman times and provide clues on the pronunciation of spoken Latin. Examples are "CIL" IV, 7838: "Vettium Firmum / aed"[ilem] "quactiliar"[ii] "rog"[ant]. Here, "qu" is pronounced "co". The 83 pieces of graffiti found at "CIL" IV, 4706-85 are evidence of the ability to read and write at levels of society where literacy might not be expected. The graffiti appear on a peristyle which was being remodeled at the time of the eruption of Vesuvius by the architect Crescens. The graffiti were left by both the foreman and his workers. The brothel at "CIL" VII, 12, 18–20 contains more than 120 pieces of graffiti, some of which were the work of the prostitutes and their clients. The gladiatorial academy at "CIL" IV, 4397 was scrawled with graffiti left by the gladiator Celadus Crescens ("Suspirium puellarum Celadus thraex": "Celadus the Thracian makes the girls sigh.")


title: Graffiti

text: Another piece from Pompeii, written on a tavern wall about the owner of the establishment and his questionable wine:


title: Graffiti

text: It was not only the Greeks and Romans who produced graffiti: the Maya site of Tikal in Guatemala contains examples of ancient Maya graffiti. Viking graffiti survive in Rome and at Newgrange Mound in Ireland, and a Varangian scratched his name (Halvdan) in runes on a banister in the Hagia Sophia at Constantinople. These early forms of graffiti have contributed to the understanding of lifestyles and languages of past cultures.


title: Graffiti

text: When Renaissance artists such as Pinturicchio, Raphael, Michelangelo, Ghirlandaio, or Filippino Lippi descended into the ruins of Nero's Domus Aurea, they carved or painted their names and returned to initiate the "grottesche" style of decoration.


title: Graffiti

text: There are also examples of graffiti occurring in American history, such as Independence Rock, a national landmark along the Oregon Trail.


title: Graffiti

text: Later, French soldiers carved their names on monuments during the Napoleonic in the 1790s. Lord Byron's survives on one of the columns of the Temple of Poseidon at Cape Sounion in Attica, Greece.


title: Graffiti

text: Contemporary graffiti style has been heavily influenced by hip hop culture and the myriad international styles derived from Philadelphia and New York City Subway graffiti, however, there are many other traditions of notable graffiti in the twentieth century. Graffiti have long appeared on building walls, in latrines, railroad boxcars, subways, and bridges.


title: Graffiti

text: The oldest known example of modern graffiti are the "monikers" found on traincars created by hobos and railworkers since the late 1800s. The Bozo Texino monikers were documented by filmmaker Bill Daniel in his 2005 film, "Who is Bozo Texino?".


title: Graffiti

text: Some graffiti have their own poignancy. In World War II, an inscription on a wall at the fortress of Verdun was seen as an illustration of the US response twice in a generation to the wrongs of the Old World:


title: Graffiti

text: During World War II and for decades after, the phrase "Kilroy was here" with an accompanying illustration was widespread throughout the world, due to its use by American troops and ultimately filtering into American popular culture. Shortly after the death of Charlie Parker (nicknamed "Yardbird" or "Bird"), graffiti began appearing around New York with the words "Bird Lives". The student protests and general strike of May 1968 saw Paris bedecked in revolutionary, anarchistic, and situationist slogans such as "L'ennui est contre-révolutionnaire" ("Boredom is counterrevolutionary") expressed in painted graffiti, poster art, and stencil art. At the time in the US, other political phrases (such as "Free Huey" about Black Panther Huey Newton) became briefly popular as graffiti in limited areas, only to be forgotten. A popular graffito of the early 1970s was "Dick Nixon Before He Dicks You", reflecting the hostility of the youth culture to that US president.


title: Graffiti

text: Rock and roll graffiti is a significant subgenre. A famous graffito of the twentieth century was the inscription in London reading "Clapton is God" in reference to the guitarist Eric Clapton. Creating the cult of the guitar hero, the phrase was spray-painted by an admirer on a wall in an Islington, north London in the autumn of 1967. The graffito was captured in a photograph, in which a dog is urinating on the wall.


title: Graffiti

text: Graffiti also became associated with the anti-establishment punk rock movement beginning in the 1970s. Bands such as Black Flag and Crass (and their followers) widely stenciled their names and logos, while many punk night clubs, squats, and hangouts are famous for their graffiti.


title: Graffiti

text: "Style Wars" depicted not only famous graffitists such as Skeme, Dondi, MinOne, and ZEPHYR, but also reinforced graffiti's role within New York's emerging hip-hop culture by incorporating famous early break-dancing groups such as Rock Steady Crew into the film and featuring rap in the soundtrack. Although many officers of the New York City Police Department found this film to be controversial, Style Wars is still recognized as the most prolific film representation of what was going on within the young hip hop culture of the early 1980s. Fab5 Freddy and Futura 2000 took hip hop graffiti to Paris and London as part of the New York City Rap Tour in 1983.


title: Graffiti

text: This period also saw the emergence of the new stencil graffiti genre. Some of the first examples were created in 1981 by graffitists Blek le Rat in Paris, in 1982 by Jef Aerosol in Tours (France); by 1985 stencils had appeared in other cities including New York City, Sydney, and Melbourne, where they were documented by American photographer Charles Gatewood and Australian photographer Rennie Ellis.


title: Graffiti

text: With the popularity and legitimization of graffiti has come a level of commercialization. In 2001, computer giant IBM launched an advertising campaign in Chicago and San Francisco which involved people spray painting on sidewalks a peace symbol, a heart, and a penguin (Linux mascot), to represent "Peace, Love, and Linux." IBM paid Chicago and San Francisco collectively US$120,000 for punitive damages and clean-up costs.


title: Graffiti

text: In 2005, a similar ad campaign was launched by Sony and executed by its advertising agency in New York, Chicago, Atlanta, Philadelphia, Los Angeles, and Miami, to market its handheld PSP gaming system. In this campaign, taking notice of the legal problems of the IBM campaign, Sony paid building owners for the rights to paint on their buildings "a collection of dizzy-eyed urban kids playing with the PSP as if it were a skateboard, a paddle, or a rocking horse".


title: Graffiti

text: Marc Ecko, an urban clothing designer, has been an advocate of graffiti as an art form during this period, stating that "Graffiti is without question the most powerful art movement in recent history and has been a driving inspiration throughout my career."


title: Graffiti

text: Graffiti have become a common stepping stone for many members of both the art and design communities in North America and abroad. Within the United States graffitists such as Mike Giant, Pursue, Rime, Noah, and countless others have made careers in skateboard, apparel, and shoe design for companies such as DC Shoes, Adidas, Rebel8, Osiris, or Circa Meanwhile, there are many others such as DZINE, Daze, Blade, and The Mac who have made the switch to being gallery artists, often not even using their initial medium, spray paint.


title: Graffiti

text: Tristan Manco wrote that Brazil "boasts a unique and particularly rich, graffiti scene ... [earning] it an international reputation as the place to go for artistic inspiration." Graffiti "flourishes in every conceivable space in Brazil's cities." Artistic parallels "are often drawn between the energy of São Paulo today and 1970s New York." The "sprawling metropolis," of São Paulo has "become the new shrine to graffiti;" Manco alludes to "poverty and unemployment ... [and] the epic struggles and conditions of the country's marginalised peoples," and to "Brazil's chronic poverty," as the main engines that "have fuelled a vibrant graffiti culture." In world terms, Brazil has "one of the most uneven distributions of income. Laws and taxes change frequently." Such factors, Manco argues, contribute to a very fluid society, riven with those economic divisions and social tensions that underpin and feed the "folkloric vandalism and an urban sport for the disenfranchised," that is South American graffiti art.


title: Graffiti

text: Prominent Brazilian graffitists include Os Gêmeos, Boleta, Nunca, Nina, Speto, Tikka, and T.Freak. Their artistic success and involvement in commercial design ventures has highlighted divisions within the Brazilian graffiti community between adherents of the cruder transgressive form of "pichação" and the more conventionally artistic values of the practitioners of "grafite".


title: Graffiti

text: Graffiti in the Middle East has emerged slowly, with taggers operating in Egypt, Lebanon, the Gulf countries like Bahrein or the United Arab Emirates, Israel, and in Iran. The major Iranian newspaper "Hamshahri" has published two articles on illegal writers in the city with photographic coverage of Iranian artist A1one's works on Tehran walls. Tokyo-based design magazine, "PingMag", has interviewed A1one and featured photographs of his work. The Israeli West Bank barrier has become a site for graffiti, reminiscent in this sense of the Berlin Wall. Many graffitists in Israel come from other places around the globe, such as JUIF from Los Angeles and DEVIONE from London. The religious reference "נ נח נחמ נחמן מאומן" ("Na Nach Nachma Nachman Meuman") is commonly seen in graffiti around Israel.


title: Graffiti

text: Graffiti has played an important role within the street art scene in the Middle East and North Africa (MENA), especially following the events of the Arab Spring of 2011 or the Sudanese Revolution of 2018/19. Graffiti is a tool of expression in the context of conflict in the region, allowing people to raise their voices politically and socially. Famous street artist Banksy has had an important effect in the street art scene in the MENA area, especially in Palestine where some of his works are located in the West Bank barrier and Bethlehem.


title: Graffiti

text: There are also a large number of graffiti influences in Southeast Asian countries that mostly come from modern Western culture, such as Malaysia, where graffiti have long been a common sight in Malaysia's capital city, Kuala Lumpur. Since 2010, the country has begun hosting a street festival to encourage all generations and people from all walks of life to enjoy and encourage Malaysian street culture.


title: Graffiti

text: The modern-day graffitists can be found with an arsenal of various materials that allow for a successful production of a piece. This includes such techniques as scribing. However, spray paint in aerosol cans is the number one medium for graffiti. From this commodity comes different styles, technique, and abilities to form master works of graffiti. Spray paint can be found at hardware and art stores and comes in virtually every color.


title: Graffiti

text: Stencil graffiti is created by cutting out shapes and designs in a stiff material (such as cardboard or subject folders) to form an overall design or image. The stencil is then placed on the "canvas" gently and with quick, easy strokes of the aerosol can, the image begins to appear on the intended surface.


title: Graffiti

text: Modern graffiti art often incorporates additional arts and technologies. For example, Graffiti Research Lab has encouraged the use of projected images and magnetic light-emitting diodes (throwies) as new media for graffitists. Yarnbombing is another recent form of graffiti. Yarnbombers occasionally target previous graffiti for modification, which had been avoided among the majority of graffitists.


title: Graffiti

text: Tagging is the practice of someone spray-painting "their name, initial or logo onto a public surface".


title: Graffiti

text: Theories on the use of graffiti by avant-garde artists have a history dating back at least to the Asger Jorn, who in 1962 painting declared in a graffiti-like gesture "the avant-garde won't give up".


title: Graffiti

text: Many contemporary analysts and even art critics have begun to see artistic value in some graffiti and to recognize it as a form of public art. According to many art researchers, particularly in the Netherlands and in Los Angeles, that type of public art is, in fact an effective tool of social emancipation or, in the achievement of a political goal.


title: Graffiti

text: In times of conflict, such murals have offered a means of communication and self-expression for members of these socially, ethnically, or racially divided communities, and have proven themselves as effective tools in establishing dialog and thus, of addressing cleavages in the long run. The Berlin Wall was also extensively covered by graffiti reflecting social pressures relating to the oppressive Soviet rule over the GDR.


title: Graffiti

text: Many artists involved with graffiti are also concerned with the similar activity of stenciling. Essentially, this entails stenciling a print of one or more colors using spray-paint. Recognized while exhibiting and publishing several of her coloured stencils and paintings portraying the Sri Lankan Civil War and urban Britain in the early 2000s, graffitists Mathangi Arulpragasam, aka M.I.A., has also become known for integrating her imagery of political violence into her music videos for singles "Galang" and "Bucky Done Gun", and her cover art. Stickers of her artwork also often appear around places such as London in Brick Lane, stuck to lamp posts and street signs, she having become a muse for other graffitists and painters worldwide in cities including Seville.


title: Graffiti

text: With the commercialization of graffiti (and hip hop in general), in most cases, even with legally painted "graffiti" art, graffitists tend to choose anonymity. This may be attributed to various reasons or a combination of reasons. Graffiti still remains the one of four hip hop elements that is not considered "performance art" despite the image of the "singing and dancing star" that sells hip hop culture to the mainstream. Being a graphic form of art, it might also be said that many graffitists still fall in the category of the introverted archetypal artist.


title: Graffiti

text: Banksy is one of the world's most notorious and popular street artists who continues to remain faceless in today's society. He is known for his political, anti-war stencil art mainly in Bristol, England, but his work may be seen anywhere from Los Angeles to Palestine. In the UK, Banksy is the most recognizable icon for this cultural artistic movement and keeps his identity a secret to avoid arrest. Much of Banksy's artwork may be seen around the streets of London and surrounding suburbs, although he has painted pictures throughout the world, including the Middle East, where he has painted on Israel's controversial West Bank barrier with satirical images of life on the other side. One depicted a hole in the wall with an idyllic beach, while another shows a mountain landscape on the other side. A number of exhibitions also have taken place since 2000, and recent works of art have fetched vast sums of money. Banksy's art is a prime example of the classic controversy: vandalism vs. art. Art supporters endorse his work distributed in urban areas as pieces of art and some councils, such as Bristol and Islington, have officially protected them, while officials of other areas have deemed his work to be vandalism and have removed it.


title: Graffiti

text: Pixnit is another artist who chooses to keep her identity from the general public. Her work focuses on beauty and design aspects of graffiti as opposed to Banksy's anti-government shock value. Her paintings are often of flower designs above shops and stores in her local urban area of Cambridge, Massachusetts. Some store owners endorse her work and encourage others to do similar work as well. "One of the pieces was left up above Steve's Kitchen, because it looks pretty awesome"- Erin Scott, the manager of New England Comics in Allston, Massachusetts.


title: Graffiti

text: Graffiti artists may become offended if photographs of their art are published in a commercial context without their permission. In March 2020, the Finnish graffiti artist Psyke expressed his displeasure at the newspaper "Ilta-Sanomat" publishing a photograph of a Peugeot 208 in an article about new cars, with his graffiti prominently shown on the background. The artist claims he does not want his art being used in commercial context, not even if he were to receive compensation.


title: Graffiti

text: Territorial graffiti marks urban neighborhoods with tags and logos to differentiate certain groups from others. These images are meant to show outsiders a stern look at whose turf is whose. The subject matter of gang-related graffiti consists of cryptic symbols and initials strictly fashioned with unique calligraphies. Gang members use graffiti to designate membership throughout the gang, to differentiate rivals and associates and, most commonly, to mark borders which are both territorial and ideological.


title: Graffiti

text: Graffiti has been used as a means of advertising both legally and illegally. Bronx-based TATS CRU has made a name for themselves doing legal advertising campaigns for companies such as Coca-Cola, McDonald's, Toyota, and MTV. In the UK, Covent Garden's Boxfresh used stencil images of a Zapatista revolutionary in the hopes that cross referencing would promote their store.


title: Graffiti

text: Smirnoff hired artists to use reverse graffiti (the use of high pressure hoses to clean dirty surfaces to leave a clean image in the surrounding dirt) to increase awareness of their product.


title: Graffiti

text: Graffiti often has a reputation as part of a subculture that rebels against authority, although the considerations of the practitioners often diverge and can relate to a wide range of attitudes. It can express a political practice and can form just one tool in an array of resistance techniques. One early example includes the anarcho-punk band Crass, who conducted a campaign of stenciling anti-war, anarchist, feminist, and anti-consumerist messages throughout the London Underground system during the late 1970s and early 1980s. In Amsterdam graffiti was a major part of the punk scene. The city was covered with names such as "De Zoot", "Vendex", and "Dr Rat". To document the graffiti a punk magazine was started that was called "Gallery Anus". So when hip hop came to Europe in the early 1980s there was already a vibrant graffiti culture.


title: Graffiti

text: The student protests and general strike of May 1968 saw Paris bedecked in revolutionary, anarchistic, and situationist slogans such as "L'ennui est contre-révolutionnaire" ("Boredom is counterrevolutionary") and "Lisez moins, vivez plus" ("Read less, live more"). While not exhaustive, the graffiti gave a sense of the 'millenarian' and rebellious spirit, tempered with a good deal of verbal wit, of the strikers.


title: Graffiti

text: The developments of graffiti art which took place in art galleries and colleges as well as "on the street" or "underground", contributed to the resurfacing in the 1990s of a far more overtly politicized art form in the subvertising, culture jamming, or tactical media movements. These movements or styles tend to classify the artists by their relationship to their social and economic contexts, since, in most countries, graffiti art remains illegal in many forms except when using non-permanent paint. Since the 1990s with the rise of Street Art, a growing number of artists are switching to non-permanent paints and non-traditional forms of painting.


title: Graffiti

text: Contemporary practitioners, accordingly, have varied and often conflicting practices. Some individuals, such as Alexander Brener, have used the medium to politicize other art forms, and have used the prison sentences enforced on them as a means of further protest.


title: Graffiti

text: The practices of anonymous groups and individuals also vary widely, and practitioners by no means always agree with each other's practices. For example, the anti-capitalist art group the Space Hijackers did a piece in 2004 about the contradiction between the capitalistic elements of Banksy and his use of political imagery.


title: Graffiti

text: Berlin human rights activist Irmela Mensah-Schramm has received global media attention and numerous awards for her 35-year campaign of effacing neo-Nazi and other right-wing extremist graffiti throughout Germany, often by altering hate speech in humorous ways.


title: Graffiti

text: In Serbian capital, Belgrade, the graffiti depicting a uniformed former general of Serb army and war criminal, convicted at ICTY for war crimes and crimes against humanity, including genocide and ethnic cleansing in Bosnian War, Ratko Mladić, appeared in a military salute alongside the words, ""General, thank to your mother"."


title: Graffiti

text: Aleks Eror, Berlin-based journalist, explains how "veneration of historical and wartime figures" through street art is not a new phenomenon in the region of former Yugoslavia, and that "in most cases is firmly focused on the future, rather than retelling the past". Eror is not only analyst pointing to danger of such an expressions for the region's future. In a long expose on the subject of Bosnian genocide denial, at Balkan Diskurs magazine and multimedia platform website, Kristina Gadže and Taylor Whitsell referred to these experiences as a young generations' "cultural heritage", in which young are being exposed to celebration and affirmation of war-criminals as part of their "formal education" and "inheritance".


title: Graffiti

text: There are numerous examples of genocide denial through celebration and affirmation of war criminals throughout the region of Western Balkans inhabited by Serbs using this form of artistic expression. Several more of these graffiti are found in Serbian capital, and many more across Serbia and Bosnian and Herzegovinian administrative entity, Republika Srpska, which is the ethnic Serbian majority enclave. Critics point that Serbia as a state, is willing to defend the mural of convicted war criminal, and have no intention to react on cases of genocide denial, noting that Interior Minister of Serbia, Aleksandar Vulin decision to ban any gathering with an intent to remove the mural, with the deployment of riot police, sends the message of "tacit endorsement". Consequently, on 9 November 2021, Serbian heavy police in riot gear, with graffiti creators and their supporters, blocked the access to the mural to prevent human rights groups and other activists to paint over it and mark the International Day Against Fascism and Antisemitism in that way, and even arrested two civic activist for throwing eggs at the graffiti.


title: Graffiti

text: Graffiti may also be used as an offensive expression. This form of graffiti may be difficult to identify, as it is mostly removed by the local authority (as councils which have adopted strategies of criminalization also strive to remove graffiti quickly). Therefore, existing racist graffiti is mostly more subtle and at first sight, not easily recognized as "racist". It can then be understood only if one knows the relevant "local code" (social, historical, political, temporal, and spatial), which is seen as heteroglot and thus a 'unique set of conditions' in a cultural context.


title: Graffiti

text: By making the graffiti less explicit (as adapted to social and legal constraints), these drawings are less likely to be removed, but do not lose their threatening and offensive character.


title: Graffiti

text: Elsewhere, activists in Russia have used painted caricatures of local officials with their mouths as potholes, to show their anger about the poor state of the roads. In Manchester, England a graffitists painted obscene images around potholes, which often resulted in their being repaired within 48 hours.


title: Graffiti

text: In the early 1980s, the first art galleries to show graffitists to the public were Fashion Moda in the Bronx, Now Gallery and Fun Gallery, both in the East Village, Manhattan.


title: Graffiti

text: A 2006 exhibition at the Brooklyn Museum displayed graffiti as an art form that began in New York's outer boroughs and reached great heights in the early 1980s with the work of Crash, Lee, Daze, Keith Haring, and Jean-Michel Basquiat. It displayed 22 works by New York graffitists, including Crash, Daze, and Lady Pink. In an article about the exhibition in the magazine "Time Out", curator Charlotta Kotik said that she hoped the exhibition would cause viewers to rethink their assumptions about graffiti.


title: Graffiti

text: From the 1970s onwards, Burhan Dogancay photographed urban walls all over the world; these he then archived for use as sources of inspiration for his painterly works. The project today known as "Walls of the World" grew beyond even his own expectations and comprises about 30,000 individual images. It spans a period of 40 years across five continents and 114 countries. In 1982, photographs from this project comprised a one-man exhibition titled "Les murs murmurent, ils crient, ils chantent..." (The walls whisper, shout and sing...) at the Centre Georges Pompidou in Paris.


title: Graffiti

text: In Australia, art historians have judged some local graffiti of sufficient creative merit to rank them firmly within the arts. Oxford University Press's art history text "Australian Painting 1788–2000" concludes with a long discussion of graffiti's key place within contemporary visual culture, including the work of several Australian practitioners.


title: Graffiti

text: Between March and April 2009, 150 artists exhibited 300 pieces of graffiti at the Grand Palais in Paris.


title: Graffiti

text: Spray paint has many negative environmental effects. The paint contains toxic chemicals, and the can uses volatile hydrocarbon gases to spray the paint onto a surface.


title: Graffiti

text: Volatile organic compound (VOC) leads to ground level ozone formation and most of graffiti related emissions are VOCs. A 2010 paper estimates 4,862 tons of VOCs were released in the United States in activities related to graffiti.


title: Graffiti

text: In China, Mao Zedong in the 1920s used revolutionary slogans and paintings in public places to galvanise the country's communist revolution.


title: Graffiti

text: Based on different national conditions, many people believe that China's attitude towards Graffiti is fierce, but in fact, according to Lance Crayon in his film "Spray Paint Beijing: Graffiti in the Capital of China", Graffiti is generally accepted in Beijing, with artists not seeing much police interference. Political and religiously sensitive graffiti, however, is not allowed.


title: Graffiti

text: In Hong Kong, Tsang Tsou Choi was known as the "King of Kowloon" for his calligraphy graffiti over many years, in which he claimed ownership of the area. Now some of his work is preserved officially.


title: Graffiti

text: In Taiwan, the government has made some concessions to graffitists. Since 2005 they have been allowed to freely display their work along some sections of riverside retaining walls in designated "Graffiti Zones". From 2007, Taipei's department of cultural affairs also began permitting graffiti on fences around major public construction sites. Department head Yong-ping Lee (李永萍) stated, "We will promote graffiti starting with the public sector, and then later in the private sector too. It's our goal to beautify the city with graffiti". The government later helped organize a graffiti contest in Ximending, a popular shopping district. graffitists caught working outside of these designated areas still face fines up to NT$6,000 under a department of environmental protection regulation. However, Taiwanese authorities can be relatively lenient, one veteran police officer stating anonymously, "Unless someone complains about vandalism, we won't get involved. We don't go after it proactively."


title: Graffiti

text: In 1993, after several expensive cars in Singapore were spray-painted, the police arrested a student from the Singapore American School, Michael P. Fay, questioned him, and subsequently charged him with vandalism. Fay pleaded guilty to vandalizing a car in addition to stealing road signs. Under the 1966 Vandalism Act of Singapore, originally passed to curb the spread of communist graffiti in Singapore, the court sentenced him to four months in jail, a fine of S$3,500 (US$2,233), and a caning. "The New York Times" ran several editorials and op-eds that condemned the punishment and called on the American public to flood the Singaporean embassy with protests. Although the Singapore government received many calls for clemency, Fay's caning took place in Singapore on 5 May 1994. Fay had originally received a sentence of six strokes of the cane, but the presiding president of Singapore, Ong Teng Cheong, agreed to reduce his caning sentence to four lashes.


title: Graffiti

text: In South Korea, Park Jung-soo was fined two million South Korean won by the Seoul Central District Court for spray-painting a rat on posters of the G-20 Summit a few days before the event in November 2011. Park alleged that the initial in "G-20" sounds like the Korean word for "rat", but Korean government prosecutors alleged that Park was making a derogatory statement about the president of South Korea, Lee Myung-bak, the host of the summit. This case led to public outcry and debate on the lack of government tolerance and in support of freedom of expression. The court ruled that the painting, "an ominous creature like a rat" amounts to "an organized criminal activity" and upheld the fine while denying the prosecution's request for imprisonment for Park.


title: Graffiti

text: In Europe, community cleaning squads have responded to graffiti, in some cases with reckless abandon, as when in 1992 in France a local Scout group, attempting to remove modern graffiti, damaged two prehistoric paintings of bison in the Cave of Mayrière supérieure near the French village of Bruniquel in Tarn-et-Garonne, earning them the 1992 Ig Nobel Prize in archeology.


title: Graffiti

text: In September 2006, the European Parliament directed the European Commission to create urban environment policies to prevent and eliminate dirt, litter, graffiti, animal excrement, and excessive noise from domestic and vehicular music systems in European cities, along with other concerns over urban life.


title: Graffiti

text: In Budapest, Hungary, both a city-backed movement called "I Love Budapest" and a special police division tackle the problem, including the provision of approved areas.


title: Graffiti

text: The Anti-Social Behaviour Act 2003 became Britain's latest anti-graffiti legislation. In August 2004, the Keep Britain Tidy campaign issued a press release calling for zero tolerance of graffiti and supporting proposals such as issuing "on the spot" fines to graffiti offenders and banning the sale of aerosol paint to anyone under the age of 16. The press release also condemned the use of graffiti images in advertising and in music videos, arguing that real-world experience of graffiti stood far removed from its often-portrayed "cool" or "edgy'" image.


title: Graffiti

text: To back the campaign, 123 Members of Parliament (MPs) (including then Prime Minister Tony Blair), signed a charter which stated: "Graffiti is not art, it's crime. On behalf of my constituents, I will do all I can to rid our community of this problem."


title: Graffiti

text: In the UK, city councils have the power to take action against the owner of any property that has been defaced under the Anti-social Behaviour Act 2003 (as amended by the Clean Neighbourhoods and Environment Act 2005) or, in certain cases, the Highways Act. This is often used against owners of property that are complacent in allowing protective boards to be defaced so long as the property is not damaged.


title: Graffiti

text: In July 2008, a conspiracy charge was used to convict graffitists for the first time. After a three-month police surveillance operation, nine members of the DPM crew were convicted of conspiracy to commit criminal damage costing at least £1 million. Five of them received prison sentences, ranging from eighteen months to two years. The unprecedented scale of the investigation and the severity of the sentences rekindled public debate over whether graffiti should be considered art or crime.


title: Graffiti

text: Some councils, like those of Stroud and Loerrach, provide approved areas in the town where graffitists can showcase their talents, including underpasses, car parks, and walls that might otherwise prove a target for the "spray and run".


title: Graffiti

text: In an effort to reduce vandalism, many cities in Australia have designated walls or areas exclusively for use by graffitists. One early example is the "Graffiti Tunnel" located at the Camperdown Campus of the University of Sydney, which is available for use by any student at the university to tag, advertise, poster, and create "art". Advocates of this idea suggest that this discourages petty vandalism yet encourages artists to take their time and produce great art, without worry of being caught or arrested for vandalism or trespassing. Others disagree with this approach, arguing that the presence of legal graffiti walls does not demonstrably reduce illegal graffiti elsewhere. Some local government areas throughout Australia have introduced "anti-graffiti squads", who clean graffiti in the area, and such crews as BCW (Buffers Can't Win) have taken steps to keep one step ahead of local graffiti cleaners.


title: Graffiti

text: Many state governments have banned the sale or possession of spray paint to those under the age of 18 (age of majority). However, a number of local governments in Victoria have taken steps to recognize the cultural heritage value of some examples of graffiti, such as prominent political graffiti. Tough new graffiti laws have been introduced in Australia with fines of up to A$26,000 and two years in prison.


title: Graffiti

text: Melbourne is a prominent graffiti city of Australia with many of its lanes being tourist attractions, such as Hosier Lane in particular, a popular destination for photographers, wedding photography, and backdrops for corporate print advertising. The Lonely Planet travel guide cites Melbourne's street as a major attraction. All forms of graffiti, including sticker art, poster, stencil art, and wheatpasting, can be found in many places throughout the city. Prominent street art precincts include; Fitzroy, Collingwood, Northcote, Brunswick, St. Kilda, and the CBD, where stencil and sticker art is prominent. As one moves farther away from the city, mostly along suburban train lines, graffiti tags become more prominent. Many international artists such as Banksy have left their work in Melbourne and in early 2008 a perspex screen was installed to prevent a Banksy stencil art piece from being destroyed, it has survived since 2003 through the respect of local street artists avoiding posting over it, although it has recently had paint tipped over it.


title: Graffiti

text: In February 2008 Helen Clark, the New Zealand prime minister at that time, announced a government crackdown on tagging and other forms of graffiti vandalism, describing it as a destructive crime representing an invasion of public and private property. New legislation subsequently adopted included a ban on the sale of paint spray cans to persons under 18 and increases in maximum fines for the offence from NZ$200 to NZ$2,000 or extended community service. The issue of tagging become a widely debated one following an incident in Auckland during January 2008 in which a middle-aged property owner stabbed one of two teenage taggers to death and was subsequently convicted of manslaughter.


title: Graffiti

text: Graffiti databases have increased in the past decade because they allow vandalism incidents to be fully documented against an offender and help the police and prosecution charge and prosecute offenders for multiple counts of vandalism. They also provide law enforcement the ability to rapidly search for an offender's moniker or tag in a simple, effective, and comprehensive way. These systems can also help track costs of damage to city to help allocate an anti-graffiti budget. The theory is that when an offender is caught putting up graffiti, they are not just charged with one count of vandalism; they can be held accountable for all the other damage for which they are responsible. This has two main benefits for law enforcement. One, it sends a signal to the offenders that their vandalism is being tracked. Two, a city can seek restitution from offenders for all the damage that they have committed, not merely a single incident. These systems give law enforcement personnel real-time, street-level intelligence that allows them not only to focus on the worst graffiti offenders and their damage, but also to monitor potential gang violence that is associated with the graffiti.


title: Graffiti

text: Many restrictions of civil gang injunctions are designed to help address and protect the physical environment and limit graffiti. Provisions of gang injunctions include things such as restricting the possession of marker pens, spray paint cans, or other sharp objects capable of defacing private or public property; spray painting, or marking with marker pens, scratching, applying stickers, or otherwise applying graffiti on any public or private property, including, but not limited to the street, alley, residences, block walls, and fences, vehicles or any other real or personal property. Some injunctions contain wording that restricts damaging or vandalizing both public and private property, including but not limited to any vehicle, light fixture, door, fence, wall, gate, window, building, street sign, utility box, telephone box, tree, or power pole.


title: Graffiti

text: To help address many of these issues, many local jurisdictions have set up graffiti abatement hotlines, where citizens can call in and report vandalism and have it removed. San Diego's hotline receives more than 5,000 calls per year, in addition to reporting the graffiti, callers can learn more about prevention. One of the complaints about these hotlines is the response time; there is often a lag time between a property owner calling about the graffiti and its removal. The length of delay should be a consideration for any jurisdiction planning on operating a hotline. Local jurisdictions must convince the callers that their complaint of vandalism will be a priority and cleaned off right away. If the jurisdiction does not have the resources to respond to complaints in a timely manner, the value of the hotline diminishes. Crews must be able to respond to individual service calls made to the graffiti hotline as well as focus on cleanup near schools, parks, and major intersections and transit routes to have the biggest impact. Some cities offer a reward for information leading to the arrest and prosecution of suspects for tagging or graffiti related vandalism. The amount of the reward is based on the information provided, and the action taken.


title: Graffiti

text: When police obtain search warrants in connection with a vandalism investigation, they are often seeking judicial approval to look for items such as cans of spray paint and nozzles from other kinds of aerosol sprays; etching tools, or other sharp or pointed objects, which could be used to etch or scratch glass and other hard surfaces; permanent marking pens, markers, or paint sticks; evidence of membership or affiliation with any gang or tagging crew; paraphernalia including any reference to "(tagger's name)"; any drawings, writing, objects, or graffiti depicting taggers' names, initials, logos, monikers, slogans, or any mention of tagging crew membership; and any newspaper clippings relating to graffiti crime.


title: Twilight Zone accident

text: On July 23, 1982, a Bell UH-1 Iroquois helicopter crashed at Indian Dunes in Valencia, California, United States, during the making of "". The crash killed actor Vic Morrow and child actors Myca Dinh Le and Renee Shin-Yi Chen, who were on the ground, and injured the six helicopter passengers. The incident led to years of civil and criminal action against the personnel overseeing the shoot, including director John Landis, and the introduction of new procedures and safety standards in the filmmaking industry.


title: Twilight Zone accident

text: "" featured four segments. In the script for the first segment, "Time Out", character Bill Connor (Vic Morrow) is transported back in time to the Vietnam War, where he has become a Vietnamese man protecting two children from American troops.


title: Twilight Zone accident

text: Filmmaker John Landis, who directed this first segment, violated California's child labor laws by hiring seven-year-old Myca Dinh Le and six-year-old Renee Shin-Yi Chen () without the required permits. Landis and several other staff members were also responsible for a number of labor violations connected with other people involved in the accident, which came to light afterwards.


title: Twilight Zone accident

text: The children were hired after Peter Wei-Teh Chen, Renee's uncle, was approached by a colleague whose wife was a production secretary for the film. Chen first thought of his brother's six-year-old daughter Renee, whose parents agreed to let her participate. He then called a Vietnamese colleague, Daniel Le, who had a seven-year-old son named Myca. Myca was an outgoing boy who enjoyed posing for pictures, so his parents thought he would be interested. Chen later testified that he was never informed that either of the children would be in proximity to a helicopter or explosives.


title: Twilight Zone accident

text: Le and Chen were being paid under the table to circumvent state law, which did not permit children to work at night. Landis opted not to seek a special waiver, either because he did not think that he would get permission for such a late hour or because he knew that he would not get approval to have young children in a scene with a large number of explosives. Casting agents were unaware that the children would be involved in the scene. Associate producer George Folsey Jr. told the children's parents not to tell any firefighters on the set that the children were part of the scene and hid them from a fire safety officer who also worked as a welfare worker. A fire safety officer was concerned that the blasts would cause a crash, but he did not tell Landis of his concerns.


title: Twilight Zone accident

text: The filming location was Indian Dunes, a movie ranch in the Valencia neighborhood of what is now the city Santa Clarita, California, that was used throughout the 1980s in films and television shows, including "The Color Purple", "Escape from New York", "MacGyver", and "China Beach". The location was within the 30-mile zone, its wide-open area permitted more pyrotechnic effects, and it was possible to shoot night scenes without city lights visible in the background. Indian Dunes' also featured a wide topography of green hills, dry desert, dense woods, and jungle-like riverbeds along the Santa Clara River which made it suitable to double for locations around the world, including Afghanistan, Myanmar, Brazil, and Vietnam.


title: Twilight Zone accident

text: The night scene called for Morrow's character to carry the two children out of a deserted village and across a shallow river while being pursued by American soldiers in a hovering helicopter. The helicopter was piloted by Vietnam War veteran Dorcey Wingo. During the filming, Wingo stationed his helicopter from the ground, while hovering near a large mortar effect; he then turned the aircraft 180 degrees to the left for the next camera shot. The effect was detonated while the helicopter's tail-rotor was still above it, causing the rotor to fail and detach from the tail. The low-flying helicopter spun out of control. At the same time, Morrow dropped Chen into the water. He was reaching out to grab her when the helicopter fell on top of him and the two children. Morrow and Le were decapitated by the helicopter's main rotor blades, while Chen was crushed to death by the helicopter's right landing skid; all three died almost instantly.


title: Twilight Zone accident

text: At the trial, the defense claimed that the explosions were detonated at the wrong time. Randall Robinson, an assistant cameraman on board the helicopter, testified that production manager Dan Allingham told Wingo, "That's too much. Let's get out of here," when the explosions were detonated, but Landis shouted over the radio: "Get lower... lower! Get over [lower]!" Robinson said that Wingo tried to leave the area, but that "we lost our control and regained it and then I could feel something let go and we began spinning around in circles." Stephen Lydecker, another camera operator on board, testified that Landis had earlier "shrugged off" warnings about the stunt with the comment, "We may lose the helicopter." Lydecker acknowledged that Landis might have been joking when he made the remark, but added, "I learned not to take anything the man said as a joke. It was his attitude. He didn't have time for suggestions from anybody."


title: Twilight Zone accident

text: In October 1984, the National Transportation Safety Board (NTSB) issued its report on the accident. The probable cause of the accident was the detonation of debris-laden high temperature special effects explosions too near to a low-flying helicopter, leading to foreign object damage to one rotor blade and delamination due to heat to the other rotor blade, the separation of the helicopter's tail rotor assembly, and the uncontrolled descent of the helicopter. The proximity of the helicopter to the special effects explosions was due to the failure to establish direct communications and coordination between the pilot, who was in command of the helicopter operation, and the film director, who was in charge of the filming operation.


title: Twilight Zone accident

text: The Federal Aviation Administration (FAA) had just instituted regulations the previous March to define how aircraft were to be regulated during film and television productions. The new regulations, however, only covered fixed-wing aircraft and not helicopters. As a result of the fatal accident, the NTSB recommended that the terms be extended to apply to all types of aircraft. In response, the FAA "amend[ed] Order 8440.5A, Chapter 14, Section 5 to clarify and emphasize that helicopter low-level movie making operations do require a certificate of waiver"; this language was officially incorporated in 1986.


title: Twilight Zone accident

text: The accident led to civil and criminal action against the filmmakers which lasted nearly a decade. Le's father, Daniel Lee, testified that he heard Landis instructing the helicopter to fly lower. All four parents testified that they were never told that there would be helicopters or explosives on set, and they had been reassured that there would be no danger, only noise. Lee, who had survived the Vietnam War and immigrated with his wife to the United States, was horrified when the explosions began on the Vietnamese village set, bringing back memories of the war.


title: Twilight Zone accident

text: Landis, Folsey, Wingo, production manager Allingham, and explosives specialist Paul Stewart were tried and acquitted on charges of manslaughter in a nine-month trial in 1986 and 1987. In the course of cross-examination, Wingo expressed his regret that Morrow had not looked "up at the helicopter" as he claimed he had instructed him to do, stating when questioned that Morrow "had over five seconds between the time that the sound of the helicopter changed and that impact", but later clarifying that he was not attempting to place blame. Wingo's comments were roundly derided, including by the prosecutor, Deputy District Attorney Lea Purwin D'Agostino, who during cross-examination had responded to Wingo's suggestion that Morrow could have evaded the helicopter by questioning how exactly Wingo expected him to have done so, observing that "Morrow was carrying the two youngsters in his arms while standing almost knee-deep in water as the helicopter, which had been hovering at 24 feet, spun toward him" and calling the testimony "quite amazing" and questioning how Wingo could "possibly have thought that Vic Morrow could have done anything to escape that helicopter under those circumstances and conditions? It's a classic example of a defense. They're blaming the parents, they're blaming the fire safety officers, they're out here blaming everyone. Now they're blaming the dead man. It's incredible." Morrow's family settled within a year; the children's families collected millions of dollars from several civil lawsuits.


title: Twilight Zone accident

text: As a result of the accident, second assistant director Andy House had his name removed from the credits of "Twilight Zone: The Movie" and replaced with "Alan Smithee." It was the first time that a director was charged due to a fatality on a set. The trial was described as "long, controversial and bitterly divisive".


title: Twilight Zone accident

text: Screen Actors Guild (SAG) spokesman Mark Locher said at the conclusion of the trial: "The entire ordeal has shaken the industry in its bottom." Warner Bros. set up dedicated safety committees to establish acceptable standards "for every aspect of filmmaking, from gunfire to fixed-wing aircraft to smoke and pyrotechnics." The standards are regularly issued as safety bulletins and published as the "Injury and Illness Prevention Program (IIPP) Safety Manual for Television & Feature Production". The IIPP manual is "a general outline of safe work practices to be used as a guideline for productions to provide a safe work environment" and is distributed to all studio employees.


title: Twilight Zone accident

text: The Directors Guild of America's safety committee began publishing regular safety bulletins for its members and established a telephone hotline to "enable directors to get quick answers to safety questions." The guild also began to discipline its members for violations of its safety procedures on sets, which it had not done prior to the crash. The SAG introduced a 24-hour hotline and safety team for its members and "encouraged members to use the right of refusal guaranteed in contracts if they believe a scene is unsafe." Filming accidents fell by 69.6-percent between 1982 and 1986, although there were still six deaths on sets.


title: Twilight Zone accident

text: Motion Picture & Entertainment Safety Program in response to the accident and to industry concerns about inconsistent enforcement of fire prevention regulations and requirements. The program oversees motion picture and television industry use of pyrotechnic special effects in California.


title: Twilight Zone accident

text: Landis spoke about the accident in a 1996 interview: "There was absolutely no good aspect about this whole story. The tragedy, which I think about every day, had an enormous impact on my career, from which I may possibly never recover."


title: Twilight Zone accident

text: Filmmaker Steven Spielberg co-produced "Twilight Zone: The Movie" with Landis, but he broke off their friendship following the accident. Spielberg said that the crash "made me grow a little" and left everyone who worked on the movie "sick to the center of our souls". He added: "No movie is worth dying for. I think people are standing up much more now than ever before to producers and directors who ask too much. If something isn't safe, it's the right and responsibility of every actor or crew member to yell 'Cut!'"


title: Twilight Zone accident

text: The accident and criminal trial were the subjects of an episode of E! True Hollywood Story in 2000, as well as the 2020 docuseries "Cursed Films".


title: 2022 FIA World Endurance Championship

text: The 2022 FIA World Endurance Championship was the tenth season of the FIA World Endurance Championship, an auto racing series organised by the Fédération Internationale de l'Automobile (FIA) and the Automobile Club de l'Ouest (ACO). The series was open to prototype and grand tourer-style racing cars divided into four categories. World Championship titles were awarded to the leading manufacturers and drivers in both the prototype and grand tourer divisions.


title: 2022 FIA World Endurance Championship

text: It was the first season in which LMDh (Le Mans Daytona h) entries are allowed to compete alongside LMH (Le Mans Hypercar) entries on a race-by-race basis. However, they were not eligible for championship points until 2023. It was the last season for LMGTE Pro class.


title: 2022 FIA World Endurance Championship

text: The provisional calendar was announced in August 2021, featuring six rounds. Sebring and Fuji returned to the schedule after being canceled in 2021, while the second Bahrain and Portimão events were removed from the schedule. The 24 Hours of Le Mans also returned to its traditional early summer date.


title: 2022 FIA World Endurance Championship

text: In accordance with the 2017 LMP2 regulations, all cars in the LMP2 class used the Gibson GK428 V8 engine. Entries in the LMP2 Pro-Am Cup, set aside for teams with a Bronze-rated driver in their line-up, are denoted with Icons.


title: 2022 FIA World Endurance Championship

text: The highest finishing competitor entered in the World Endurance Championship is listed below. Invitational entries may have finished ahead of WEC competitors in individual races.


title: 2022 FIA World Endurance Championship

text: Five titles are offered to drivers, two with world championship status. The Hypercar World Endurance Drivers' Championship is reserved for Hypercar drivers while the GTE World Endurance Drivers' Championship is available for drivers in the LMGTE categories. FIA Endurance Trophies are awarded in LMP2, in LMP2 Pro/Am and in LMGTE Am.


title: 2022 FIA World Endurance Championship

text: Entries were required to complete the timed race as well as to complete 70% of the overall winning car's race distance in order to earn championship points. A single bonus point was awarded to the team and all drivers of the pole position car for each category in qualifying. Furthermore, a race must complete two laps under green flag conditions in order for championship points to be awarded.


title: Markdown

text: Markdown is a lightweight markup language for creating formatted text using a plain-text editor. John Gruber and Aaron Swartz created Markdown in 2004 as a markup language that is appealing to human readers in its source code form. Markdown is widely used in blogging, instant messaging, online forums, collaborative software, documentation pages, and readme files.


title: Markdown

text: The initial description of Markdown contained ambiguities and raised unanswered questions, causing implementations to both intentionally and accidentally diverge from the original version. This was addressed in 2014, when long-standing Markdown contributors released CommonMark, an unambiguous specification and test suite for Markdown.


title: Markdown

text: Markdown was inspired by pre-existing conventions for marking up plain text in email and usenet posts, such as the earlier markup languages setext "(c. 1992)", Textile "(c. 2002)", and reStructuredText "(c. 2002)".


title: Markdown

text: In 2002 Aaron Swartz created atx and referred to it as “the true structured text format”. Swartz and Gruber then worked together to create the Markdown language in 2004, with the goal of enabling people "to write using an easy-to-read and easy-to-write plain text format, optionally convert it to structurally valid XHTML (or HTML)."


title: Markdown

text: Its key design goal was "readability", that the language be readable as-is, without looking like it has been marked up with tags or formatting instructions, unlike text formatted with ‘heavier’ markup languages, such as Rich Text Format (RTF), HTML, or even wikitext (each of which have obvious in-line tags and formatting instructions which can make the text more difficult for humans to read).


title: Markdown

text: Gruber wrote a Perl script, , which converts marked-up text input to valid, well-formed XHTML or HTML and replaces angle brackets (, ) and ampersands () with their corresponding character entity references. It can take the role of a standalone script, a plugin for Blosxom or a Movable Type, or of a text filter for BBEdit.


title: Markdown

text: As Markdown's popularity grew rapidly, many Markdown implementations appeared, driven mostly by the need for additional features such as tables, footnotes, definition lists, and Markdown inside HTML blocks.


title: Markdown

text: The behavior of some of these diverged from the reference implementation, as Markdown was only characterised by an informal specification and a Perl implementation for conversion to HTML.


title: Markdown

text: At the same time, a number of ambiguities in the informal specification had attracted attention. These issues spurred the creation of tools such as Babelmark to compare the output of various implementations, and an effort by some developers of Markdown parsers for standardisation. However, Gruber has argued that complete standardization would be a mistake: "Different sites (and people) have different needs. No one syntax would make all happy."


title: Markdown

text: Gruber avoided using curly braces in Markdown to unofficially reserve them for implementation-specific extensions.


title: Markdown

text: From 2012, a group of people, including Jeff Atwood and John MacFarlane, launched what Atwood characterised as a standardisation effort. A community website now aims to "document various tools and resources available to document authors and developers, as well as implementors of the various Markdown implementations". In September 2014, Gruber objected to the usage of "Markdown" in the name of this effort and it was rebranded as CommonMark. CommonMark.org published several versions of a specification, reference implementation, test suite, and "[plans] to announce a finalized 1.0 spec and test suite in 2019." No 1.0 spec has since been released as major issues still remain unsolved. Nonetheless, the following websites and projects have adopted CommonMark: Discourse, GitHub, GitLab, Reddit, Qt, Stack Exchange (Stack Overflow), and Swift.


title: Markdown

text: Websites like GitHub, Bitbucket, Reddit, Diaspora, Stack Exchange, OpenStreetMap and SourceForge use variants of Markdown to facilitate discussion between users.


title: Markdown

text: Depending on implementation, basic inline HTML tags may be supported. Italic text may be implemented by codice_1 and/or codice_2.


title: Markdown

text: GitHub had been using its own variant of Markdown since as early as 2009, adding support for additional formatting such as tables and nesting block content inside list elements, as well as GitHub-specific features such as auto-linking references to commits, issues, usernames, etc. In 2017, GitHub released a formal specification of its GitHub Flavored Markdown (GFM) that is based on CommonMark. It is a strict superset of CommonMark, following its specification exactly except for "tables, strikethrough, autolinks and task lists," which GFM adds as extensions. GitHub also changed the parser used on their sites accordingly, which required that some documents be changed. For instance, GFM now requires that the hash symbol that creates a heading be separated from the heading text by a space character.