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Hey, you knew all those years of "ER" and "Grey's Anatomy" would pay off someday, right? Show off your mastery of medical-speak now, with our quiz!

Gas masks are used to filter out harmful gas and particles from the air industrial workers breathe. Learn about gas masks and how gas masks are made.

Ringing in ears occurs when noises louder than shouting damage parts of our inner ears. Find out more about why your ears ring at HowStuffWorks.

These tree pictures will allow you to stroll through the world of walnuts, maples, redwoods and more. Check out these tree pictures at HowStuffWorks.

Is it possible to make a nuclear-powered car? Learn more about the first nuclear powered car and how we can use nuclear power plant technology.

The legless lizard is an entirely different creature from its slithery look-alike, the snake. Learn about the legless lizard evolution and more.

3-D puzzles result in three-dimensional, structural objects when solved. Learn how 3-D puzzles work at HowStuffWorks.

Hand, foot and mouth disease can be a little misleading. Learn what hand, food and mouth disease really is and how it can be treated.

IP convergence brings your telephone, Internet, television and other services together in one place. Learn how IP convergence works.

Scientists have found striking parallels between the babbling produced by these bat pups and that by human infants.

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