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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The human brain doesn't stop developing until about 25 years old.
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The world's shortest man measures only 21.5 inches.
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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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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Human hair and fingernails continue to grow after death.
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