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How Performance-enhancing Drugs Work

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Performance-enhancing drugs are the frequent subject of controversy in the sporting world. Learn about performance-enhancing drugs and doping practices.

How Nurse Sharks Work

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Nurse sharks are mellow, sluggish sharks that hover above the ocean floor. See why nurse sharks don't have that much in common with great whites.

Can You Name All 40 of These Farm Animals?

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So you think you're six degrees from Old MacDonald, huh? Well, there's only one way to find out. If you can ace this quiz, we might just add you to the family tree! The rooster is crowing; it's time to name these farm animals now!

How Cicadas Work

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Some cicadas are annual breeders and some show up about every 17 years. They all produce a 'song' that is almost loud enough to damage our ears.

6 Facts About the Lovely, Incredibly Destructive, Lionfish

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The showy lionfish is a stunning beauty. But this invasive species, which was released into the wild in the 1980s, is wreaking havoc on delicate reef ecosystems worldwide.

The Cheetah Is a Rare Daytime Hunter Among Big Cats

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With lightning speed and incredible vision, the cheetah is the fastest land animal on Earth and the best hunter on the savanna.

Who should pay for your teen's car insurance?

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Who should pay for your teen's car insurance? Visit HowStuffWorks to learn who should pay for you teen's car insurance.

Dall Sheep

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Dall Sheep are most often recognized by their thick, curled horns. Learn cool facts about the dall sheep at HowStuffWorks.

North American Porcupine

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North American Porcupines can grow as long as 25 inches. Get more facts at HowStuffWorks.

10 Tips for Picking Out a New Family Dog

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Are you looking for some information on tips for picking out a new family dog? Check out 10 tips for picking out a new family dog to learn more on this topic.

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