Butterflies can't fly if they're cold.

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A cat's sensitivity to sound volume is 3 times that of a human. And cats sense odours 14 times more strongly than humans.

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Alexithymia describes a person who has a difficult time expressing their feelings to others.

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Scientists have found that it is over Rio de Janeiro that the sky looks bluer than anywhere else on Earth.

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A protein in human saliva called histatin can help wounds heal faster! "Licking Your Wounds" works.

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Your brain can't actually feel pain because it lacks pain receptors. A headache is caused by receptors in the protective tissue that surrounds your brain.

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There are medicines you can take that bind to sulfur compounds so your farts don't smell.

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Consecotaleophobia is the fear of chopsticks.

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After a large meal, lions can sleep for up to 24 hours straight.

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Polar bears cover their noses with their paws to make themselves invisible.

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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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