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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People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
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Poor eyesight (myopia) is associated with higher IQ.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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Forty percent of American adults cannot fill out a bank deposit slip correctly.
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Dolphins have names for one another.
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