Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The human brain is more active during sleep than during the day.
28
The human brain uses approximately as much energy as a 10 watt light bulb.
120
You can't tickle yourself.
29
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
The world's shortest man measures only 21.5 inches.
73
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Pain occurs when sounds are above 130 db.
123