It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
The Japanese, on average, are the shortest people.
320
More redheads are born in Scotland than in any other part of the world.
85
You can only remember 4 things at a time.
31
Babies cry but they don't produce tears until one to three months after birth.
238
The “cheerleader effect”, the theory that girls look more attractive in groups, is scientifically proven.
8