For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Gorillas can catch human colds and other illnesses.
205
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Human hair and fingernails continue to grow after death.
7
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Tigers can see 6 times better at night than humans.
305
The average person's skin weighs twice as much as their brain.
131