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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If your DNA was stretched out it would reach to the moon 6,000 times.
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Every human spent about half an hour as a single cell.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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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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Obsessive nose picking is called Rhinotillexomania.
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Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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