If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The human brain doesn't stop developing until about 25 years old.
102
We share 70% of our DNA with a slug.
218
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
The human body contains over a billion miles of DNA.
147
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
It takes about 20 seconds for a red blood cell to circle the whole body.
102