People who have a strong friendship possess the ability to communicate with one another through facial expressions.
46
Awarding people money for doing well in IQ tests causes them to score better, $10 increased people's score by an average of more than 20 IQ points. IQ tests don’t just measure intelligence - they also measure effort.
9
Only 2% of the Earth's population are natural redheads.
13
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 a woman has 4 sexual partners in her lifetime.
-143
It is estimated that at any one time, 0.7% of the world's population are drunk.
90