One in 500 humans has one blue eye and one brown eye.
145
Men laugh longer, louder, and more often than women.
61
Identical twins do not have identical fingerprints.
79
Women rate men more attractive if other women are looking and smiling at him.
17
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
On average a woman has 4 sexual partners in her lifetime.
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