The average sperm cell swims at 8 inches per hour.
4
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
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
If the human eye was a digital camera, it would have 576 megapixels.
25
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
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Every human spent about half an hour as a single cell.
144