Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human body contains over a billion miles of DNA.
147
On average a woman has 4 sexual partners in her lifetime.
-143
Your thumb is about the same size as your nose.
124
It takes about 20 seconds for a red blood cell to circle the whole body.
102
If the human eye was a digital camera, it would have 576 megapixels.
25
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23