The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Only humans shed emotional tears.
331
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
Yawns are more contagious among people with closer relationships.
163
On average, there's 100 billion neurons in the human brain.
83
The world's shortest man measures only 21.5 inches.
73
You can't tickle yourself.
29
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191