It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Yawns are more contagious among people with closer relationships.
163
Babies crawl an average of 200m a day.
212
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31
On average a woman has 4 sexual partners in her lifetime.
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