Only humans shed emotional tears.
331
The human body contains over a billion miles of DNA.
147
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The average sperm cell swims at 8 inches per hour.
4
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
On average a woman has 4 sexual partners in her lifetime.
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