It takes about 20 seconds for a red blood cell to circle the whole body.
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
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
94
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Pain occurs when sounds are above 130 db.
123
Only humans shed emotional tears.
331