Early American humans hunted car-size armadillos and used their shells for houses.
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Obsessive nose picking is called Rhinotillexomania.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Only humans shed emotional tears.
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The human eye blinks an average of 4,200,000 times a year.
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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