People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
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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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There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8
Intelligent people have more zinc and copper in their hair.
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