Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
A human being loses an average of 40 to 100 strands of hair a day.
133
If your DNA was stretched out it would reach to the moon 6,000 times.
256
If the human eye was a digital camera, it would have 576 megapixels.
25
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
A person can live without food for about a month, but only about a week without water.
156