It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The world's shortest man measures only 21.5 inches.
73
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The human body contains over a billion miles of DNA.
147
A person can live without food for about a month, but only about a week without water.
156
It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
218
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
On average, there's 100 billion neurons in the human brain.
83