It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Pain occurs when sounds are above 130 db.
124
A man's beard grows fastest when he anticipates sex.
239
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The human sigh acts as a physiological reset button.
23
The human brain is more active during sleep than during the day.
28
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161