Poor eyesight (myopia) is associated with higher IQ.
232
Intelligent people have more zinc and copper in their hair.
233
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
13
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.
17
There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8
Intelligent men tend to be more sexually faithful.
31