It takes about 20 seconds for a red blood cell to circle the whole body.
102
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
30
Only humans shed emotional tears.
331
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15