Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The average person will go on a date at least 100 times before they finally marry.
33
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Only humans shed emotional tears.
331
You can't tickle yourself.
29
Mushrooms are more closely related to humans than they are to plants.
47
Enamel is hardest substance in the human body.
61