People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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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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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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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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