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ied-600x350 How IEDs Work

Improvised explosive devices were the primary killer of American troops in Iraq and continue to top the list in Afghanistan. Their use is so prevalent among guerrillas and insurgents because they are so effective. They are easy to put together with parts that are easy to obtain and they are easy to hide. Learn about these terrible weapons in this episode.

iStockphoto/Thinkstock Can you die of a broken heart?


Stockbyte/Thinkstock How Breast Implants Work


Adam Gault/Digital Vision/Thinkstock How much money is in the world?


© Getty Images/Photos.com/Thinkstock How the Rosetta Stone Works

Sometimes providence smiles on historians. Thus is the case with the Rosetta stone, an ancient Egyptian tablet that served as the key for unlocking hieroglyphics, lost to time for a millennia. Learn about the international intrigue, rivalry to translate it and the luck that led to the founding of Egyptology.

Hemera/Thinkstock How did 168 conquistadors take down the Inca empire?

Just before Francisco Pizarro arrived in South American in 1532, the Inca empire covered 350,000 square miles and boasted a million inhabitants. Yet Pizarro managed to take down this vast, powerful and advanced bureaucracy with only 168 men. Find out how and learn about the Inca on this episode.

iStockphoto/Thinkstock How Broken Bones Work


© Getty Images/Photos.com/Thinkstock History’s Greatest Traitors


iStockphoto/Thinkstock How Ejection Seats Work


andre bernardo/Flickr/Getty Images How Cockroaches Work

You've seen them in your home and probably squealed in terror, but now it's time to learn all about cockroaches. From their ability to run incredibly fast to the appendage that alerts them when you're about to whack them with your shoe, cockroaches are fascinating creatures that deserve your respect.

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