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.
21
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
On average a woman has 4 sexual partners in her lifetime.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Yawns are more contagious among people with closer relationships.
163
If the human eye was a digital camera, it would have 576 megapixels.
25
A person can live without food for about a month, but only about a week without water.
156
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13