It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The human body contains over a billion miles of DNA.
147
Obsessive nose picking is called Rhinotillexomania.
101
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
The human brain doesn't stop developing until about 25 years old.
102
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82