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How Kissing Works

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Anthropologists report that 90 percent of the people in the world kiss. Learn how one gesture has come to signify affection, celebration, grief, comfort and respect.

Have you seen investigators on crime shows who spray some stuff on a "clean" carpet and suddenly -- blood stains! Well, of all the fictional technology on TV, it turns out this stuff is real! Find out how luminol reveals the blood.

How Stratego Works

entertainment.howstuffworks.com/leisure/brain-games/stratego.htm

Like chess but sneakier, Stratego is a gambit of wits and strategy. So how do you play -- and what does 19th century France have to do with it?

How Limousines Work

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Limousines have become a staple for airport transportation and formal events. Find out how limousines are manufactured and what cars are used as limousines.

How Ultrasound Works

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Ultrasound lets us peek into the human body to see everything from heart valves to a moving baby. But how do sound waves give us a picture?

How Boomerangs Work

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It's pretty amazing: When you throw a boomerang, it actually does come back to you -- if you throw it properly. Find out why the boomerang returns and how to throw it like a pro.

How Pentago Works

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Pentago, a connect-five game with a literal twist, has charmed and challenged players young and old. Learn how to play the game Pentago.

How Stuntmen Work

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Stuntmen take very dangerous risks in order to give movies an added sense of realism. Learn about stuntmen and find out how stuntmen train for their stunts.