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
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Only humans shed emotional tears.
331
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Obsessive nose picking is called Rhinotillexomania.
101
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
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137