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
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
Tigers can see 6 times better at night than humans.
305
It takes approximately 12 hours for food to entirely digest.
93
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Pain occurs when sounds are above 130 db.
124
On average a woman has 4 sexual partners in her lifetime.
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Babies crawl an average of 200m a day.
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