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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?

In the early 1990s, Japanese researchers found a strange anomaly in their study subjects, five people who had inexplicable heart attacks. From this first investigation has come a scientific mystery: Is it possible that the sudden loss of a loved one can be so difficult to bear that it can actually cause a heart attack and maybe kill you? Could the romantics be right?

Stockbyte/Thinkstock How Breast Implants Work

The first attempt at breast augmentation surgery was on a dog. The second on a woman who went in for tattoo removal. From those weird origins hundreds of thousands of breast implant procedures are now carried out each year. Find out all about the advancements and techniques in increasing your bust.

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

There are few things more futile than trying to count all of the money in the world. Even many governments have no idea how much currency they have issued. But that won't stop Chuck and Josh from trying and explaining why we can't be sure how much money exists and the problems with flooding the world markets with bread.

© 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

It’s a pretty miserable thing to break a bone. There’s the initial blinding pain, all of the medical procedures during a trip to the hospital and then, in the best case example, you have to wear a cast for four months. Beneath all of this misery, though, your body is carrying out some pretty amazing processes.

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

The annals of history hold a special place for people who have carried out treachery and betrayed their own. Thousands of years later, their names are still synonymous with being a scoundrel around the world. From Marcus Brutus to Vidkun Quisling and more, Josh and Chuck examine some of the bigger turncoats to live -- and exonerate others.

iStockphoto/Thinkstock How Ejection Seats Work

When the Jet Age came about, pilots found they had a brand new problem with their brand new planes: how to bail out when they found themselves in a pinch at 700 mph. In the mid-1940s, aerospace engineers got to work coming up with a fascinating and complex lifesaving device, the ejection seat.

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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