think so. So it's time for me to introduce our speaker who is going to present on a subject that I really need when I'm studying French vocabulary because it's amazing. Give a big applause. Thanks for the intro. All right, everything seems to be mostly in order except I have slides. Can I get slides? I see them on the monitor but not on the arrow yet. Can you see slides? Okay, okay. Yeah, it's just like the talk name right now. Okay, so I'm going to talk about Anki which some of you might know. It's a program which I use for remembering all sorts of things and I found it really useful for like geeking out about making the spectrum of things that I'm interested in geeking out about much bigger. So like here's a couple of things which I can do with Anki which I found useful. So I went back to my university education and I like went through a couple of these first year lessons where you learn like, oh, like 50 theorems about analytical geometry or something or let's say mathematical analysis and now I can like remember the proofs for them. Like I'm never going to again forget. Or you can remember<PHONE_NUMBER>997253. Yeah, I can like recite my, I've been from memory. You can use it to memorize the NATO phonetic alphabet. When I went to Switzerland I used this to learn German from basically knowing nothing to being at like B1, B2 level in about a year. I use it to memorize people's names. So if I have a picture of you somewhere online I basically assume that I have permission to put it into my Anki and to like use that to remember your face and your name. I use it to remember keyboard shortcuts. Remember like when I read the paper I use it to remember what the paper was about, what were the basic methods, like other random things like I'm not at all like a science person or like medical science person, but like I use it to memorize like a bit about the human body like the names of like major brain regions. So how Anki works. So Anki and space repetition in general works based on a thing called the spacing effect. Basically the spacing effect is, has been studied since the like beginning of the 19th, no 20th century and it's an effect where if you have one hour of time that you're willing to invest into learning something then the thing that you absolutely do not want to do is spend one whole hour in one chunk learning the thing because then like you're going to put a lot of information into your head and then you're going to forget it in two hours.  So that means that you can like invest this time into learning much more efficiently and the reason this works is that every time you're remembering the thing again after a certain time has passed since you last recalled you have to think a little bit to remember it because like you don't have it immediately in your mind and what you're doing there is like you know thinking for like maybe five, ten seconds what is the thing and then you're doing active recall and active recall is the thing which reinforces memories which makes things go from short-term memory to longer-term memory. So space repetition is an algorithm like in a very simple sense which uses this spacing effect to let you learn things fast and the thing which you do is like super simple.  If you didn't do it correctly you do it again after a shorter interval. Basically like it's typically it's done like exponentially so like DEX interval either like is multiplied by a constant or divided by a constant. So Anki is an open source tool which is used to make these flashcards so a flashcard is a thing where you you have kind of a question which in this case is like try to remember what is the integral of the logarithm of t dt and then you try to remember the answer you press show answer and if you remembered it correctly you then write like how easy or hard it was for you to remember and so this is just like a software implementation of this algorithm. Let's see right so Anki has a lot of nice things it's a multi-platform it's also on android it has a synchronization server which is not open source but there are a couple of open source ones there's syntax highlighting there's lots of premade cards which for lots lots of subjects especially people like medicine students who have to memorize a lot of stuff they make a lot of cards there's cards for every like major language there's tags that you can add on your notes and the the cards that you create in Anki are html plus javascript so you can script them you can make them potentially interactive and also it has an active developer community there's a here's a couple of examples of stuff that i like to do with Anki this is one add-on where this is an add-on which is useful for memorizing things which you can represent as images so this is this is the map of all these annoying tiny islands in the caribbean and like this is an svg where there's the name of the island and you can like overlap these things over it and then the then then like the opposite side of the card shows you the actual name of the thing and this is useful especially for like anatomy like whatever can be represented as an image or like this is like a some kind of neural network thingy it also supports latex so you can very very nicely do use it for mathematics for like definitions, torms, also i made a thing called permutants close and i use it to memorize things which i confuse so for example like i used to not be able to remember like what type of radiation is alphabeta gamma and this is a card where every time you should you see the card it will randomly permute these rows so on every permutation you will see a different order of them and you have to remember which one is which so like under the under this the answer that this asks for is like that gamma radiation consists of of photons and beta consists of electrons or positrons and alpha consists of helium nuclei or like i can use it to like memorize like which type of pasta is which is a very useful skill yes so i heard a lot of people use at least like trying anky but some people have problems like actually putting it into practice and there's there's a couple of tips which are good to follow one of them is one of them is using these closed deletions a closed deletion is a thing where you have some text and you remove a bit of the text and you ask to complete the middle that's a very useful way to phrase these questions then it's good to treat your collection as like a work of love to like refactor it to like go through it make sure that like everything is phrased like the optimal way that like every card is asking for exactly one fact to recall and not like asking you to recall like you don't want to have a card where the front says Aristotle and the back says like 50 facts about Aristotle because then if you see the word Aristotle you know you can't recall all the 50 things at once you want to have like 50 cards for each individual thing it's also good when you're reviewing cards it's good to notice where there are problems like if you're if you're noticing oh i always keep confusing these two words then it's good to notice that and like note it down in anki and later go over it and try to fix it in some fashion um then uh right i talked about redundancy and atomicity and uh anki is really nice for like gamification purposes like it's a thing which i do in all of these dislike that time when i'm like waiting in a queue standing in public transit or like sitting on the toilet uh and that means that like over a day if i have a better day i might review maybe like five cards if i have a good day if i'm like flying on an airplane if i have like 10 hours to spare i will review maybe like a thousand even uh here's a bunch of links um all of these links are in my slides which uh which are not linked here but you can find them on the wiki uh there's like a there's like a bunch of documentation recommended plugins um and uh that's the end of the content and i can also show you a demo uh how much time do we have enough okay okay so uh this is my anki setup this is this is like uh the main window and um if i click on all i just it contains even like stuff that i don't want to necessarily show publicly like like people that i know who probably wouldn't want their faces to be public but like uh here uh let's see if i can make this a bit bigger um i'm gonna hope that you guys can see this like this is a card where it asks me uh to overwrite working copies read me with the content of of the read me on the master branch and here's a comment line saying git question mark source master read me md and this is asking me to remember the word restore so i press space and it shows me the correct answer and then i uh rate that i remember this like good this was good then here i have a little bit of python like this is asking me for like daytime to date of uh 20 whatever whatever like the constructor daytime days today actually yeah um this is like this is the thing which i like learned about like earlier on this uh camp that there is a term called a process window that that's like a range of acceptable parameters for some process or like here i have some like random thing about stocks um this is the thing where um where i have where i'm like you know the terms meteorite meteor meteoroid asteroid like this these all are subtly different and just like yesterday i added a card where i decided i want to remember which one is which um or like i use it to memorize also like country flags this is Armenia this is i think Latvia yeah um or like capitals uh this is Tirana um this is Santiago this is i think Venezuela not col no columbia uh 2016 uh this is like aliases for oh my zsh this is super useful especially for like uh getting better at using your computer at using whatever tools you have because often tools will have keyboard shortcuts and uh it's good to memorize them because then you're like way faster um okay i think i think that's about like all i can all all the interesting stuff that i can show shall we have questions if if there are any questions there are mics in the path in the middle no okay then another big applause so for the next speaker i was a little confused at his subject because the title was how to survive 100 meters underwater and i was thinking about programming but it's super cool it's about scuba diving and how to survive it uh and the technical aspects of it so i can't wait to see what he's going to tell and give a big applause spinning ball of death of course so for the past few years uh uh i've been scuba diving quite a bit uh a few years ago i went on vacation to thailand uh because my manager said okay you really need to have uh some vacation uh and i was working too much and after i booked everything like a few weeks before um i thought okay what am i actually going to do there um and yeah i happened to go scuba diving and i got addicted um now uh just before covid i decided let's spend a lot of money and buy some technical diving gear because if you've ever scuba dive uh then you've got your certification from petty ssi or one of the other uh certifications and in that standard course which is usually a few days you learn okay don't go deeper than 30 meters because that's dangerous uh and you don't know how to deal with that etc so uh everything beyond that is pretty much called technical diving and that is what i've been doing for the past few years um now and it seems that a lot of people that dive have some relation to it and i was talking to some people around here and i was like okay i made a cool dive uh last march in thailand um i uh did a dive in a cave to 100 meter depth uh it's called the song hong cave uh these are some photos here uh with me uh and the equipment uh that i went down with uh i'm not sure if you still see something but okay um so uh what you see here uh is what the bottles uh that uh or the tanks that i had on my back and additional tanks that you need for the compression and such so to be perfectly clear right i'm not the scuba instructor i don't have the intention to ever becoming one uh because i don't really like uh that part of the diving and it's too commercial for my uh taste um but don't try this at home i i assume that you don't have 100 meter uh the pool but uh seriously uh if you'd like to do this very cool i'd be happy to give some tips but you do need your uh training and your certifications and such uh plus uh if you do any certifications or theory around it the first line is okay this is dangerous you take a lot of risks know what you're getting yourself into now um this is a uh a log what you can see uh uh where i did the dive um so i'm not sure if you can read the details but it took me about 25 minutes to go down uh because in a cave uh in that case you don't go straight down because there's actually rock beneath you um and it took me about 25 minutes to get to 100 meter now i could spend very long time there two minutes uh and then i had to go back up so i it took me 25 minutes to go down to 100 meter i spent our two minutes looking at uh people that put all their tags on the line like uh showing hey i've been here and then we went back up and i had uh over 90 minutes of decompression now if you're not familiar with scuba diving and what the whole decompression is so if you do these deep dives you uh uh you breathe air and if you breathe air here uh we breathe about 21 percent oxygen and 79 percent nitrogen and some other little gases but uh that's about it if you go underwater the pressure increases and the molecules get closer to each other and you basically uh breathe more of that same gas now uh with oxygen that is not necessarily a problem because uh your body takes care of it and uh that's fine uh the problem here is with nitrogen or if you go very deeper you add some helium uh that gets into your tissues and under heavy pressure that's kind of okay but if you go back up it expands now what you want to prevent there is that uh there will become bubbles in your tissues because those bubbles can get uh in uh between nerves and uh in your back in your spine uh you can get paralyzed or you can even die uh in the worst case scenario now the other problem is what kind of gases do you actually breathe so i made a list of uh how it would look like if i would go down with uh the same uh mixture of gases that we breathe here now you have something called a partial pressure and uh together you see that is 100 percent um so uh that doubles uh or uh a 10 meter that doubles and then increases at same steps every 10 meters now there are two problems here um one is at some point you get narcotic um and that is uh because of the nitrogen uh and uh that gives you a happy feeling uh maybe even stoned which is cool but not so cool if you're 100 meters underwater and you don't know what to do anymore um so what you do to prevent that is that you replace part of the nitrogen by helium which is a lighter gas and doesn't cause uh uh those same effects it does have other uh effects such as a very high uh voice which is kind of cool but uh it has benefits for that as well the downside of helium is that it's crazy expensive so if you are like okay i want to do that technical diving make sure you bring a fat wallet because it's very expensive um uh to give you some insight for these dives that i made in thailand were three deep dives it costed me about a thousand euros of gases alone so uh and that's apart from everything else now the other problem is uh uh the oxygen at some point oxygen gets poisonous and we typically indicate that on the partial pressure of the oxygen and um in diving in general the partial pressure of 1.4 uh that is the limit that you go to uh or that you can have and that means that at 1.4 um uh you don't uh get convulsions yet but anything higher if you have a high workload so if you're swimming if you're doing stuff uh it could happen um and uh getting convulsions here and dropping on the floor kind of okay uh we can handle that if you black out under water and you stop breathing or whatever yeah that's not so cool anymore so um what you do for these deep dives is that you actually decrease the uh the oxygen because uh what you do is um say on these deep dives what i did i had 13 percent of oxygen and that means that i can't breathe here uh yeah you can take one or two breaths but at some point you will pass out uh you won't die immediately but uh that also means that uh you can only breathe it uh when the po2 gets high enough for your brain and the oxygen to be processed so um yeah uh that means that you have to carefully plan everything uh when you're going down on uh such a um uh such a trip now there are great tools for doing that um uh subsurface is one of them uh it's an open source tool it was uh originally uh designed designed by lina stovals who also was uh or is a scuba diver um but um yeah so what i did here i made a quick example how i would plan a dive to 100 meter so um what you are seeing here is that i'm uh having a double 12 as they call it which means that are two tanks on your back 12 liter and i have three additional tanks with uh a decompression gases uh because uh you want on your way back all that gas is still in your tissues you want to increase the oxygen uh at the proper depth to make sure that you breathe less of the inert gases like helium and uh nitrogen and to make sure that it goes out of your tissues and then at some point you can surface um yeah so um what you see here uh for example if uh uh people can read it is that uh i go down uh on my 50 oxygen now i do that for the reason is that on the surface i cannot actually breathe the uh mix that i had in my back tanks i only have 13 percent of oxygen so at some point i switch to what i have on my gas and then i can go deeper um now at that point i am at 100 meters and uh then i can go up now how do i decide when i want to go back up so if you are diving in caves or doing deep technical dives there's the golden rule of the one-third of gas so the idea is that in your planning you always assume that you want to surface with one-third of your gas because if something goes wrong uh that means that you still have sufficient gas left uh to uh come back to the surface so uh in your entire planning you uh basically do that um now there's one other switch that you see a bit later on when i go up uh that is actually also uh with helium combined um and there's something called isobaric counter diffusion i have no idea who came up with the term but um if you switch very uh quickly to a uh between helium and nitrogen uh there could be side effects uh you can get dizzy and whatnot and what i said earlier if you get dizzy here that's all okay um uh being that underwater not such a good idea what you see in the rest of the planning at some point i go to 50 percent that's typically a 21 meters depth and uh then at six meters depth you switch to a hundred percent oxygen which means that uh at that six meters you are at uh p o 2 of 1.6 and you might think earlier didn't you say like okay um you have a maximum of 1.4 that is correct but the exception is for decompression where the assumption is you are pretty much still in the water so you don't have much activity no high workload um and as you can see after much time of being still in the water uh you can finally surface so yeah uh pretty much that is how you could survive uh but as i said at the beginning a lot of planning training exercise comes into that um so yeah that's pretty much it so um obviously you can ask questions but i had a question as well so how long does it dive like this typically take so uh that depends on the uh decompression but in this case uh the one that i did was um just over two two and a half hours wow okay that's amazing uh are there any other people who have any questions no okay well again a big applause the next speaker uh he introduced himself and i asked what he was going to talk about and he said mosaic and i was like wow that's amazing stones that's something i'm not a programmer i can understand and it was software but that actually made me more excited because now i can learn about something i had no idea about so i'm here to introduce you to bubain and he's going to tell you about mosaic i bought some of his laptop and i'm not sure how to plug it in it's uh i don't know it's his laptop the guy with the beard there it's uh i can use any any random laptop that has a web browser but it's any press harder yeah okay oh yeah it's doing something but it changed the screen resolution so it detected it at least does anyone have a laptop with hdmi that they can borrow a laptop with hdmi i kind of wanted to show the thing like i can use any laptop with like a web browser and hdmi um and i mean i can just tell about it but it's kind of boring test uh there's someone no okay so there are a couple people solving the issue that's a great idea so um we're going to swap around some things um so the next speaker let's see is um richards and he is going to tell about a subject i think is so cool it's called a furby who here has heard of the furby me too i had one when i was uh when i was a little bit smaller and then my little brother dropped it off the stairs so it broke down but my dad he actually opened it up so he took all the skin off and looked at the mechanics for him it was cool for me nightmare material but um richard here is going to tell you a lot about his furby and all the cool things that it can do so give a big applause for richard i don't have a mic but i'm going to talk about furby and i have to improvise too because there's a quick change in speaker slides can you hold the mic okay and do we have a stage for my co-speaker uh furby um you can you grab a chair for me thank you okay and i'm going to share a presentation and um so actually i'm going to talk a bit about what i'm doing here uh i'm talking about uh furby oops the screen sharing there is yeah okay cool so i have a furby here and i'm going to put him on the chair because he's very important oh that doesn't work all right um i'm afraid if you can't see it that well if if if the do demo we'll figure it out later so i'm talking about furby furby is a 90s tool that uh can talk and speak um you might remember it but i'm going to upgrade it um why does not click okay so we have the old school furby the old school furby had very limited commands this had a few commands could you say a few words it could do a few movements it's very basic there have been newer furbies since the 90s uh but i really like this one because this is the one i used to have um and i'm trying to upgrade it a bit more intelligence so the goal is that i'm going to have a real live pet it can talk it can walk it can maybe sing for me and i can talk to it it will talk back it can control the house um it can have expressions because it already has a motor in there for doing that um but the problem is it also has to be fully private so i can run it at my home without exposing any data to the cloud or to google or to them as home people um so i'm going to talk about how the furby works so there's a really nice patent that's online it will show you all the details and how the internal components are which help me to create this presentation um in the furby we have a speaker we have fur and i'm going to talk about the details here in here in the furby there will be a motor that has a worm wheel the driver's little cog that controls all the components with one motor so the eyes the ears the mouth it's all connected to one engine um so i'm going to see how i can make this all work i'm going to put a respiratory pie in there it's d or w works pretty well if it's inside it has powerful enough to run on a dark container and then it can maybe use it to use as a wakeboard trigger or relay speech to text to another server if you want to see these components i lift this from here i also have it all on github so to make space for the respiratory pie i removed a little piece on the bottom so it i cut it off with a cell very gently and now it fits really well with respiratory pie and a speaker hat so now it can do some dancing so yeah so there's some music and i wanted to share the music so it's now dancing but this is one motor the motor is continuously spinning which is beautiful and it looks cool but i really want to have control of one single expression i want to say i is open mouth closed i ears up ears down so to do this um there so we have a positioning of components inside the furby in the furby there's a wheel the wheel is one talking about earlier it's drive by the motor it has a little wheel that is connected to a slide and the position of the hook from the eyes is in one slide there is another wheel for another gear another part and the pin will slide through the wheel and the position of the wheel will tell how the eyes will look to do this we have a little wheel here those wheel turns there's a little gap in the wheel and when we have a light sensor in here it's positioned right here on the bottom there's a light and then there's a sensor the wheel turns and then there's a gap in the wheel right there that every time the light is shining through the wheel we can count it as a pulse and by this we can very accurately position all the engine parts and all the expressions and body parts with this one wheel so these are all the settings that i have but to demonstrate it i brought my furby but i think i'm going to do a video here i'm gonna start here by doing the calibration sequence i'm turning the wheel full clock cycle to know when it hits the button because every time the wheel makes one full turn it presses a button now it says calibrated the furby is now ready to go so it starts at like i press it down years up years down so i'm still trying to make a combination of the expressions in here i can say okay i want you now to sing a happy song for me and it will go do that expression or it will look disappointed at me or it will be bored so now demonstrating every sequence of this wheel so it's going as you can see i can really have full control of where it stops and where it goes yeah it's really happy to see it now the Furby clock works as follows if the eyes are let's say open and ears are high and i want to go to here i first have to go through all these steps but i can probably toggle somewhere with the expression here in between or an expression in between here this way i can really make an expression as a complete set but like i said before the whole thing should be private so there's implementations of alexa that you can install on your pie and you can relay your whole house to alexa but this is too easy and i don't want to do that so i use raspy which is an open source alexa program you can configure it and run it on the purby connected to mqtt we do the same thing on the biggest server i have at the home we have pdp11 and we connect it to home assistant and then you can relay the mqtt commands to home assistant and then control the u lights and then the u lights consecutively when you for instance walk into a room the motion sensor triggers it sends an mqtt event then the mqtt event will publish a rascale to the furby to make an expression and to also do some text to speech so um this is how that works i need to get some breath okay um with raspy you can do custom wake word detection that means that if i now say hey furby it will tell me hi back so hey furby i don't know if you heard that but furby was singing yeah da da da da da when i said hey furby so with raspy you can make your own wake word setup um there's probably a tool that's not part of raspy to do that um but it's it's really nice to set it up um cool now to configure raspy we have a few sentences it's like what time is it or tell me with the time you write the sentences down this sentence then triggers an mqtt event that goes to home assistant um and then it also triggers the furby to have a sort of like nice effect so this is home assistant if you don't have a furby it's still pretty cool to set it up uh you can easily integrate with everything in your house it's open source you can make shell scripts you can put it all in git repository you can easily deploy it to manage it it's a really nice tool to play around with on the weekend so the whole project is still work in progress um so i showed you now that i have gained full control on how the furby looks but i want to make this into a sequence of events that can combine make an expression um so with this expression i can make a rest call and then connect the rest server to the mqtt server um and of course uh we have the furby here but there's still plenty of room for camera so i can also add face recognition and image recognition and then make it like a real animal that will be happy to see you of course um the whole project uh kind of works now quite predictably so it's not as nice as a cat the cat will greet you or not maybe it will not greet you the dog will or not so for me this is like quite boring so it's only magic if you understand that somebody said this to somebody yesterday i thought it was quite funny um so i want to match some randomness or some unpredictable or some intelligence that will be like surprising or nice to see so it will become magic and like real pet um it is online it is on github so you can look at the source it's still very basic right now so i still want to put all the slides that i made today because the whole idea came up yesterday and i need to like document it's like when you look through the code you can still like look at all the references and make sense of it uh that's my email address and if you have other ideas please come talk to me and i'd love to add more to this project or share it with you thank you well thank you richard that was amazing i learned so much if anyone has any questions again they're mic's in the middle or you could email or well just ask so uh thank you thank you and then for the next speaker uh you want to share your slides on here right okay i have to show where's it um so are you going to go last okay so uh a little bit of change of plans just to let you know there are two more talks so in the program there was only one but now there are going to be two more talks uh you can go last if that's okay with you does it work is it oh sorry i have to change the keyboard layout there we go so our next talk i already introduced it's about mosaic and now the laptop works which is amazing um and he's going to talk about like i said mosaic so another applause and then he can start can i like do it full screen uh the website yeah yeah sure and then you want to look at read me no i'm just uh the website here oh okay um let's give another try uh i'm pein and um yeah i'm originally software developer and then i studied electrical engineering and i see design and then i figured that actually the software that i see designers use is kind of not so great uh so i decided to write open source software for i see designers um so this project is basically that it's a schematic editor for i see design you can also use it for us like simulating other stuff so it's like basically spy simulator interface um and i will talk a bit about it but also what i want to do i see a few people with laptops one nice thing about this are like different thing about this app is that it's online and collaborative so if people with laptops in their labs um will go to nyankad with a d at the end dot github dot i o stijs mosaic and then you can go to try online we can actually add it the same schematic and i will be able to see hopefully what people in the audience are drawing which will be i think a funny experiment um this is the main uh yeah so this is the entry point of the application where you sort of manage your libraries and your models and your stuff uh you see the little spinny thing in the corner it means it's like download downloading uh the database now because it's by default it's uh it talks to a cloud a couch db database in the cloud um so uh yeah it will synchronize uh your schematics there but you can also use it offline it's like an offline first application so uh if you like go into workspace properties and remove the synchronization url you have a purely offline application you can also run your own couch db or whatever um um and can i go to the previous tab while it's loading um no okay uh i will just add an interface and see what happens so let's design a filter or something and add a schematic let me name it mch filter and now if i like in theory this should eventually show up on uh your versions of the thing if you have a laptop in your lab and if you double click it you can open the editor um um yeah this is the main editor um it's designed to be like very easy easy to use but also quite powerful so you can like like everything has like you know mouse buttons that should be obvious but you can also hide all the stuff and use keyboard shortcuts for everything so i can like press r and it will place a resistor oh it looks kind of a bit broken maybe this he says is a bit not loaded anyway um hello help how do i get back to like i'm no but like i did this like where it's zoomed out of the window i'm not sure why how i can get back into the uh this is like an apple thing i'm just not like talk to furby oh okay you're on your another different work okay um maybe maybe it's now completely broken um anyway let's delete this one and place a voltage source and draw some wires and some more wires uh okay it's quite difficult to do with one hand um yeah so that's uh the basic idea uh it seems to oh and i'm scared to press escape now because when i press escape previously it did something weird anyway um so next thing i can show like i assume nobody has made it to this place yet because i don't see anyone else at it showing up um what i can try now is to run actually a simulation in the cloud so what normally what you would do is you can install this like so it's now it's running purely as a web application but of course if you want to run a simulation you need to run some simulation somewhere um there's also a desktop installation which is based on jupiter lab um but there's also um this thing called my binder which allows you to like turn a docker repository or like a github repository into a docker image and then run it into the cloud um so i mean demo effect this will not probably not work but it's technically yeah okay good luck um it should be possible to like launch instantly into a cloud environment where you can just like run a spy simulator that's open source uh to simulate your thing but obviously not today so uh i mean yeah that's i'm not sure what i'll say want to show um you can manage libraries draw schematics simulate them but yeah that basically what i wanted to say is that like an easy to use interface for like you know clickity click just draw schematic and run basic simulations there's also like a notebook interface where you can like write python code to run simulations for more advanced automation um and yeah well here you can see a bit of the simulation interface but uh it's a bit small and of course nothing works but anyway i just wanted to show this and if you're interested you can play around or ask me about it or whatever that's all i have i guess too bad that there are so many wi-fi issues mine has been overloaded all day it's like you try to load one wikipedia page and the thing has a seizure i can say that because i've epilepsy um if there are any questions again mics are in the middle but i think they can also just approach you yeah and um don't be afraid to check it out i think you could just play around with it and uh yeah it's on github it's like uh nyancat.github.io slash mosaic okay so if i want to try this out but should i google or magnancat mosaic okay well thank you so much then our next speaker is going to speak about a subject that i as the younger generation although it's maybe but bad to say that are going to have a lot of problems with which is climate change but not only are we going to have problems with it in the future we are already experiencing so many issues so the next talk is going to be about how we should take action now thank you hello thank you thank you my name is mdb um i also in my dreams i'll call calling myself daya or daya in english with five letters um and formally i dreamed about um dreaming together with other people i dreamed about the world trade center as well like driving one two-seater into the world trade center and others co-dreamed this into a big airplane and that was a mess in my dreams so okay i also dreamed about climate catastrophes happening uh which are already happening now and i did refuse to think about or imagine what could go worse in the in the sense that in the in the hope that with knowing what is coming towards us told by scientists the people especially the people in power would change their courses the course of humanity to the better and avoid such things um but it's all rigged we have a money system monetary system that is driving even more money to money and money and totally forgetting about the environment um everyone can rethink about 2021 and i think everyone has memories of catastrophes happening globally at least twice a week and this was not the case years ago or decades ago um we are now having temperatures rising very much more and more and net zero and stay of zero two in the air in the in the atmosphere is based on sinks available like amazon forest like um the great barrier reef around all around the continent of australia and also the plankton in the mere in the top layers of the seas of the oceans um we all know amazon uh forest has been reduced very much the um the the the the reefs have been are drying and are mostly dead meanwhile and by diffusion of co2 into the top or top layers of the oceans in the top um sea surface that surface where the plankton is living is becoming a bubble water um with um height h2 co3 with an acid with with acid becoming more and more acidic and this will lead to the plankton dying as well so the sinks for the co2 in the atmosphere are partially gone and some of them are going right now and the co2 that is now uh 421 micro parts right 421 ppm um will even raise some of it is not yet in the upper layers of the atmosphere where it's doing the worst um effects heating up our planet and so what we have now like in 2021 will be our future for at least 20 years same as 21 21 at least 20 years and with inaction and letting our rulers um proceed to um rule everything sorry this will be so worse i mean i can imagine the floors in brandenburg around berlin are getting deserts this means the soil has um is the earth is gone and it's mostly sand left over in brandenburg around berlin where the big droughts for the last few years have been and i imagine like we will have lots of um winds not only heat points like now still winds but also have events because these temperature differences need to be um sorry equalized right they equalize each other and so the winds will get stronger also with higher temperatures i was told that every degree celsius gives the air seven percent more storage of water capacity um so there will be stronger and heavier wind so to say it's probably hard to understand but winds will get stronger and we will have like in five years we will have probably within action at least within action we will have every day at least one tornado in every country in europe and it can be typhoons or tornadoes and as the soil is mostly sand there will be lots of sand so we get sand storms and this is terrific not only for the living beings but also for the solar panels that are heavily damaged by sand storms and of course it's not good for wind turbines as well so we will have lots and lots of trouble which is not being seen by our rulers our rulers are ignoring the IPCC um um assessment report six currently which is with the management report very very bad despite the fact that there is filtering from the science single scientists at the bottom that has to take care what he's saying to the public for third for for his external payments still coming in and him not losing jobs for example germany the most scientists have only limited for two years working agreements so they are very much in danger of not being employed anymore if they lose their third external money sources um so they have to take care that they are not free to speak freely what they found out and what they think will happen and how it will be in the second level of the IPCC there's the group same thing happening again then the area of subject or area of region uh same thing happening again and in the fourth level there's the management report which is talked with lobbies and governments and every word is gone through and checked against if that is maybe not what the governments really want to hear the public to hear so and still if you look at these pages it's about 200 to 300 pages uh was different parts of the management summary if you go through this you will see it's very very bad to know this and i i i i i i make a bad chancellor our chairman chancellor did not read it he did not order anyone to read it and he has no one that has read it and telling him how bad it is even with government intervention and lobby intervention and everything i told you right now which is just logically i cannot prove it but you everyone knows how it is it's the word we live in and it's rigged maybe maybe maybe it would help to remove money globally but this is one thing that cannot be done by single persons or whatever so and i think this will not be done by our rulers at all but it would help a lot if you imagine a society for requirements so everyone gets food water or drinks whatever um shelter um and from time to time some fun of course not to spare it out and everyone needs the stuff he needs to do his work because we can't live with an exchange um trade system because this would not allow specialists to continue the work and we need specialists for example for plutonium to keep we cannot keep this with hands we need technology we need to continue usually be able to using technology to contain the plutonium we have 300 tons 1.3 1.3 million kilograms and one kilogram or five kilograms doesn't matter really equally distributed about the surface of the earth would be enough to kill all life and these 1,300 tons 30 million kilograms 13 gigagrams um of plutonium um are mostly of that isotope that has 24 000 years halftime which means we have to keep it for another 430 000 years safe to get back to a an amount that is not really that harmful in theory in practice we have lots of um pollutions via um we're manufacturing uh like um again um and also by um accidents like channel bill or in japan uh which and lost bombs of course lost uh nuclear war nuclear bombs nuclear warheads um so we already have a kind of pollution that has to be removed sooner or later and after the climate crisis if we manage to go through this as a society as a working society as a fully um capable society next thing I think will be to collect the plutonium back from the earth to contain it and to treat it in a manner that has yet has to be invented thank you very much well thank you on a talk that is a subject I personally find very important now again there are max at the path so if anyone has any questions please ask them and I think you'll be approachable for questions afterwards as well yes sure yes so um that were the lightning talks for today a big applause for everyone who spoke who helped organize them and yourself for listening to all of them


Hello guys. How are you? Okay. Please type in your name. Okay. So today again in this session, we are going to discuss some board level questions on chemistry okay, so Till now, I think we have already finished four to five years question Four to five years previous year questions of chemistry which has been asked in class 12 board exam Okay, so today we are going to discuss one more Set of questions. Okay, which is Rome has been asked in Board exam. Okay, so All of you who are there, please type in your name in the comment box and We'll start the class in few minutes. Okay You see this question question number 30. I'm giving you. We are starting from the back Think about it few minutes Then we'll start discussing it. Yeah. Hi, resist justice again, let me you know Justice justice again, so this question number 30. Yeah, tell me what is the answer of the first one? Why do transition elements show variable oxidation is just one key what you write down you don't need to write down all the answers Electrons in N-1 DNS can participate in metallic bonding due to a similar energy in So it is basically because of uncured electron in the orbitals. Okay. Yeah, it's correct So that's how it shows variable oxygen state depending on the compound. Okay What is the answer for the second one name the elements showing maximum number of oxidation is state Among the first series of transition metals among the first series of transition metals. What is the answer for this one? Right, it's magnies Next question name the element which shows plus three oxidation state Only plus three not plus three only plus three. What is the answer? Elements which shows only plus three oxidation state Scandium right Scandium is the only elements in 3d series which shows plus three oxidation is state You can draw the electronic configuration and you'll understand. Okay, and there are a few more things into that the size of the elements and Intered electronic repulsion also. So basically because of all these factors is caddy Scandium can only, you know a Release three electrons and so that it can show plus three oxidation is state. What is lanthanide contraction? Tell me, okay So what is lanthanide contraction? It's more than the expected decrease in size of atoms across lanthanide series due to poor shielding effect of 3d and 4f orbital 3d also you mentioned Okay So lanthanide contraction is basically is the reduction in size in the elements of lanthanide series Okay, reduction in size in the elements of lanthanide series due to poor shielding of d and f orbital completely filled d and f orbital, it's correct Yeah, and what is this mesh metal? It is MIS CH I think This is check this spelling is it MIS CH mixed metal Yeah, so the example is Mish the spelling I'll write down here the important alloy which contains Some of the lanthanide metals. The name is M or just a second. I'll just reduce this MIS CH This is the spelling. It is the alloy of I'll write down here alloy of cerium Lanthanum lanthanum there. These are the male two elements present here and apart from this there are other elements also present Okay, okay, so this is the example of Alloy which contains lanthanide metals cerium lanthanum mainly it contains and apart from these two They also contain some rare earth metals. Okay and This this kind of you know alloy it is used for the you know Production of the flints of lighters, okay flints of lighter used to products used to produce with the help of this, okay? So that's the thing. Okay. We use to prepare. So that's what use we have here flints of lighter views Okay, next question you see we have to see no Just a second we have done this now this one Yes Complete the following equation CR the four two minus in acidic medium What is the answer in the second one CR two or seven two minus process two is correct? Second one.  The reaction is balanced or not So with O2 it is balanced. So the product in the second reaction will be K2 MnO four Plus Will get here MnO two and O two now you see the reaction is balanced here We have to KMnO four then the reaction will be minus this forms CR two or seven two minus with H2O Now all these you see charge Atom everything is balanced here next question Give reasons for all these Mn three plus is the changes to Mn plus two The orbital really accepts another electron as T5 for configuration. Yes Correct the reason is correct, but you see one thing. I will tell you here I mean three plus where it get oxidized When it gets reduced and oxidize others, which is nothing but the oxidizing agent behavior So when it is it behaves as an oxidizing agent Mn three plus will have tendency to convert into Mn plus two right like all of you are saying This configuration is extremely stable. Okay, so that is also right. It's not wrong But it's better to write Mn plus two has exactly half fit the configuration Which is highly stable because of symmetry, okay All these keywords are important when you write down the answer in your answer sheet for board exams. Okay, so you must use this keyword that it has half fit configuration, which is extremely stable because of Symmetry, okay, so that's the keyword you should write here. So take that in keep that in mind Okay, so it's correct. Your answer is correct, but all those keywords that I told you keep that in mind now Second one E naught Mn two plus two M values are not regular or first drop term is an element. Tell me Yes, good Yes, variation in ionization in thalpe's are irregular and why is that so because of the variation in size? Okay, so size also you can write down here left to right if you go in a periodic table the size What happens size size decreases because of increase in effective nuclear charge, right? So when you go left to right in a critical the size decreases because of increase in effective nuclear charge But usually in case of transition element, what happens when you go from left to right in 3d series The electrons are continuously going into the orbital Okay, and as the electrons are increasing in number into the orbital there is more inter-electronic repulsion Right and because of inter-electronic repulsion and the effective nuclear charge both are Both are contradicting to each other, right? Both are contradicting each other because of inter-electronic repulsion the side the elements has Like because of that repulsion the size should be more but but because of effective nuclear charge the size should be less Okay, so both are contradictory to each other. So when you keep on going from Left to right direction in a period Number of electrons in the orbital is increasing which increases the inter-electronic repulsion Which gradually overcome the effective nuclear charge and hence the size becomes similar After a few elements five or six elements and then for the last two elements copper and zinc the size increases because the inter-electronic repulsion then dominates the Effective nuclear charge the point I'm trying to make is what as we go From left to right in your periodic table in transition series 3d series the size first decreases First the size decreases then becomes constant and then increases for the last two element Okay, so you see there is a irregularity in size of the elements Okay, and because of this irregularities also Ionization enthalpy is also not regular ionization enthalpy is also Irregular because of this only this value which is nothing but the ionization energy this enthalpy is Not regular. That's what the question. Okay, so you have to mention the size thing also here Right now the next question is what although Floating is more electronegative than oxygen the highest magnees fluoride is Mn F4 Whereas the oxygen the highest oxidized oxide is Mn 207. Okay, and why is it so?


So I hand over to Stockholm for the official welcome speech. Thanks. This won't be a speech. I just want to thank you all for coming, for attending. I welcome you very much. I'm glad that so many, again, had the chance to come. Yeah, I feel always accelerated when I meet so many DV developers, and I enjoy it immensely to meet you every year. A few months ago, I was at a conference in Finland, and there was a representative of a big multinational company talking about their business model and WebSphere and stuff. And he said that his company was in the Linux market not for the ideological things like making the world a better place or so, but for money and for building business and stuff. And later on, I gave a talk, and I said that, among other things, that Debian was in the Linux market not to make money, but to make the world a better place, among other things. And just a few days ago, I met here in Mexico a guy who uses Debian in a small linguistic project where he works with some tribes, which don't have a language, but they would want to keep the language. And so they work with pedagogues and linguists to develop alphabets and everything. And he uses Debian, and he walks long distances because there are no roads and stuff, and he works with hardly any existing budget. And for some reason, that excited me more, made me more happy, more proud even, than just another phone call with a big company representative which uses Debian to boost their business because it's a stable and reliable system. And I was really happy to hear that here in Mexico, we actually do help as a force for good to make the world a better place for some people. And I would like to thank you for being part of that, for building packages, for making a high quality distribution that is actually so usable, so worthwhile, so actually great. And yeah, well, this is something that I'm really proud of, to be able to work with you and with this conference, to trick you all into working with Debian one more year, to put more energy into it, to be excited about it, and to spend immense amounts of time on this, even though you don't get anything from it. Well, you get something, but most likely not money. Thank you very much. And now I need to volunteer who wears this kind of t-shirt because I need to have a look at all the sponsors. Could you please stand up and turn around? Thank you. We have, of course, a lot of sponsors this year again. Most outstanding again is HP, which gave us a little less than half of the conference budget, I think. Really, if you see an HP representative, give him a hug. Oh, yeah. Thank you. Thank you. Then, right, not right, but then we have, as a really noticeable sponsor, Nokia, and almost right on the same level, Intel, which gave, yeah, a lot of money. We have also IBM and Gandy. Do you know Gandy? That's the small registrar. And lots of deep-in developers actually use it. NetApp also on the same level. Opera software, and there were more. Yeah, we have so many sponsors. It's really hard to, yeah. We have HP, IBM, Intel, and then a Mexican, Jagueta. Guna will mention what they sponsored. Nokia, VA Linux, Ubuntu, Talart, Telecom, Aruba, they are doing our wireless network here. AlphaNAS, Colax, Xandros, FNB, they are doing hosting, Gandy, GNU, Linux, no, actually, they are the extra-madura place in Spain, which helped us sponsor travel, sponsored trip. This one I can't read. Linspire, Linux, New Media, they are giving us a one-page ad in their magazines worldwide, which we used to attract sponsors with a thank you ad. MySQL, and this must be the University of Pedagogic Things here in Mexico. NetApp, Opera, Software, O'Reilly, which gave you books. Here comes the University with, OK, I'm not sure. CineNomino, Associated, Unvention, Amazon, CompuGraph, NeoCenter, Copy Left, VoxKit, and ByteMark hosting. They are doing the hosting for a Debcon fork. Yeah, I guess you all know that without their money, we most likely wouldn't be as many as we are now, like 20 or 30, I guess. I'm not sure.  There are Gunnar, where's Gunnar? There, here. He lost a lot of weight, by the way. I'm not sure it's due to. It's not due to Debcon, but he did that on purpose. And then we have his wife, Gabriela, who also, yeah, well, I think they actually split the work. Somewhere else also, Darmock is somewhere here? Is he here? I'm not sure. And Yair, no, no, Yair, he's helped a lot with a wireless setup and with shopping for our needs. So we have a quite small local team, which spent a lot of effort on this to make this happen. And I would like to thank you guys very much. Punco, where's he? Is he here? He's in Mexico. He's the guy who built our wireless antennas and the access points, which do the bridging from the high pole on the, where's the, somewhere there, down to the internet cafe in the village. Yeah, it has been a very exciting time, the Debcamp time, actually, because lots of things happened then and the internet became stable, actually. We hope that the pole on the roof keeps being stable. It doesn't fall off. Yeah. Now I would like to ask Gunnar to say a few words. And if our beloved DPL is here, could he perhaps also move himself? And no. OK, yeah. OK, thanks. Well, a few words. I was not prepared for this. Well, thank you. I'm very, very happy to finally have you here. It's been, well, at least three years of trying to bring you all and one year working, because for everybody who's interested in having Debcamp in their countries, it's very important that you get involved in the Debcamp team at least 20 years before. And one year of hellish work here. I really hope this will make the free software movement and the Debian involvement in Mexico grow. Well, I don't know. I could also go again through the list of local sponsors. Of course, the local companies have helped us most with infrastructure, with lending equipment we could not have got otherwise. I'm not going over the list that Stockholm already read. I don't know if you have any other piece of clothes to give to us. No? OK, well, there's not much more to say. We have many people also who, well, even we don't know, but we don't have their names like handy, but have helped us tremendously. And well, I know I can count on any of you. So even if you don't expect it, we will be requiring random people to do random stuff. The nice thing about Debian is that we know we can do it. We know each of you, each of the people that came to Debcamp are part of the team. Each of you are interested in working with us. So this is not just another conference. Well, and that's it for me. So welcome and enjoy your stay. Have a nice time. And Tolimar, you are the protocol man.