Only humans shed emotional tears.
331
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Your fingernails grow faster in summer.
744
A person can live without food for about a month, but only about a week without water.
156