On average, there's 100 billion neurons in the human brain.
83
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
Every human spent about half an hour as a single cell.
144