A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
By weight, Bone is five times stronger than steel.
417
You can't tickle yourself.
29
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
30
The human body contains over a billion miles of DNA.
147
Obsessive nose picking is called Rhinotillexomania.
101