You don't have any muscles in your fingers. All of the muscles that move your fingers are in your palms and forearms.

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Crocodiles have no lips and can hold their breath for an hour.

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YouTube was originally intended to be a dating site with the slogan “Tune In, Hook Up” - however its creators couldn’t find anyone willing to submit videos, even when they were offered cash.

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Snakes use their tongue to smell.

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Rats know how to laugh.

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In Japan, if the train is at least 10 seconds late, travel will be free.

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Dogs wag their tails to the right when they're happy and to the left when they're frightened.

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There are volcanoes that release blue lava.

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The spots and colors you see when you rub your eyes are called "phosphenes."

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Without skin, a person can live for only 30 seconds.

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You can't kill yourself by holding your breath.

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Cheetahs don't roar -- Instead, they meow like house cats.

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Laughter and social status have a close connection: the higher your position in society, the less often you will laugh.

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Rats and Horses can't vomit.

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Originally, the tie was invented to distinguish the rich from the poor.

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Some people can remember almost every day of their lives. The condition is called "Hyperthymesia."

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Male elephants use their penises to scratch their stomachs.

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Yawning doesn't always necessarily mean you're tired, it also means your body needs more oxygen.

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Girls see with their side vision 75% better than men.

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It would take one month for a sloth to travel a mile.

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