Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
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Your body is creating and killing about 2.4 million red blood cells per second.
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Your thumb is about the same size as your nose.
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If your DNA was stretched out it would reach to the moon 6,000 times.
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Your heart will pump about 212 million liters in its lifetime.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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