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.
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You can only remember 4 things at a time.
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Poor eyesight (myopia) is associated with higher IQ.
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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In the US, people can be rejected from joining the police force if they are too intelligent.
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The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
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