It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
On average, there's 100 billion neurons in the human brain.
83
Obsessive nose picking is called Rhinotillexomania.
101
The human sigh acts as a physiological reset button.
23
The human brain is more active during sleep than during the day.
28
Research has determined that most people are happiest at 7:26pm on a Saturday night.
70
Mushrooms are more closely related to humans than they are to plants.
47
One human hair can support 3 ounces.
191