The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
On average a woman has 4 sexual partners in her lifetime.
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Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
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
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
A person can live without food for about a month, but only about a week without water.
156
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Research has determined that most people are happiest at 7:26pm on a Saturday night.
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