Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
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Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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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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Research has determined that most people are happiest at 7:26pm on a Saturday night.
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The world's shortest man measures only 21.5 inches.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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