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.
-143
The human body contains over a billion miles of DNA.
147
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 human brain has the capacity to store everything that you experience.
4k
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
Every human spent about half an hour as a single cell.
144
One human hair can support 3 ounces.
191