If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Water is actually naturally blue.
48
There is a tiger named Kenny who is the only known tiger to have downs syndrome.
10
The human sigh acts as a physiological reset button.
23