Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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The human brain uses approximately as much energy as a 10 watt light bulb.
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For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
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The human body contains over a billion miles of DNA.
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A person can live without food for about a month, but only about a week without water.
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