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
Intelligent people have more zinc and copper in their hair.
233
There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8
In the US, people can be rejected from joining the police force if they are too intelligent.
45
Poor eyesight (myopia) is associated with higher IQ.
232
People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
13
Intelligent men tend to be more sexually faithful.
31