The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Every human spent about half an hour as a single cell.
144
Poor eyesight (myopia) is associated with higher IQ.
232
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
All 13 minerals necessary for human life can be found in alcohol beverages.
282
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137