On average, there's 100 billion neurons in the human brain.
83
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Yawns are more contagious among people with closer relationships.
163
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
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29