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
Half of all Americans over the age of 55 have no teeth.
39
A study had men report their own penis size, and the average was found to be 6.1-6.5 inches. A subsequent clinical study actually measured penises, and found the average size to be 5.1-5.7 inches.
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More than half the population of Kenya is under the age of 15.
71
Just one in three consumers pays off his or her credit card bill every month.
27
One in 500 humans has one blue eye and one brown eye.
145
People who have a strong friendship possess the ability to communicate with one another through facial expressions.
46