A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The human sigh acts as a physiological reset button.
23
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
In one day, adult lungs move about 10,000 litres of air.
11
If your DNA was stretched out it would reach to the moon 6,000 times.
256