Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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A human being loses an average of 40 to 100 strands of hair a day.
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The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
23
Your body is creating and killing about 2.4 million red blood cells per second.
17
Your thumb is about the same size as your nose.
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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
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