By weight, Bone is five times stronger than steel.
417
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The average sperm cell swims at 8 inches per hour.
4
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Every human spent about half an hour as a single cell.
144
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69