The human brain doesn't stop developing until about 25 years old.
102
Poor eyesight (myopia) is associated with higher IQ.
232
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
The average sperm cell swims at 8 inches per hour.
4
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
It takes approximately 12 hours for food to entirely digest.
93