Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
In one day, adult lungs move about 10,000 litres of air.
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The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
If you are cold you are more likely to be hungry because you use energy to keep warm.
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The human brain uses approximately as much energy as a 10 watt light bulb.
120
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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