Americans did not commonly use forks until after the Civil War.
82
Babies' eyes do not produce tears until the baby is approximately six to eight weeks old.
58
The typical person spends about 600 hours having sex between the ages of 20 and 70.
234
One in 500 humans has one blue eye and one brown eye.
145
Infants spend more time dreaming than adults do.
102
Up to the age of six or seven months a child can breathe and swallow at the same time. An adult cannot do this.
165
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11