Enamel is hardest substance in the human body.
61
Poor eyesight (myopia) is associated with higher IQ.
232
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
If the human eye was a digital camera, it would have 576 megapixels.
25