It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
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
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
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
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Your fingernails grow faster in summer.
744
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198