Only humans shed emotional tears.
331
Yawns are more contagious among people with closer relationships.
163
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Your fingernails grow faster in summer.
744
You can't tickle yourself.
29
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
The largest cell in the human body is the female egg and the smallest is the male sperm.
682