Only humans shed emotional tears.
331
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Yawns are more contagious among people with closer relationships.
163
If your DNA was stretched out it would reach to the moon 6,000 times.
256
All 13 minerals necessary for human life can be found in alcohol beverages.
282
A man's beard grows fastest when he anticipates sex.
239
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13