Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Poor eyesight (myopia) is associated with higher IQ.
232
Babies crawl an average of 200m a day.
212
It takes approximately 12 hours for food to entirely digest.
93
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
You can't tickle yourself.
29
The average sperm cell swims at 8 inches per hour.
4