It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
The average person's skin weighs twice as much as their brain.
131
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
If your DNA was stretched out it would reach to the moon 6,000 times.
256
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266