Tigers can see 6 times better at night than humans.
305
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
It takes approximately 12 hours for food to entirely digest.
93
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
If the human eye was a digital camera, it would have 576 megapixels.
25
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132