Your fingernails grow faster in summer.
744
In one day, adult lungs move about 10,000 litres of air.
11
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
By weight, Bone is five times stronger than steel.
417