A man's beard grows fastest when he anticipates sex.
239
It takes about 20 seconds for a red blood cell to circle the whole body.
102
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
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Yawns are more contagious among people with closer relationships.
163
Babies crawl an average of 200m a day.
212
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
The human brain has the capacity to store everything that you experience.
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