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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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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Poor eyesight (myopia) is associated with higher IQ.
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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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Forty percent of American adults cannot fill out a bank deposit slip correctly.
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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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Intelligent people have more zinc and copper in their hair.
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There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
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