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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If your DNA was stretched out it would reach to the moon 6,000 times.
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We share 70% of our DNA with a slug.
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Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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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.
15
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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