Intelligent people have more zinc and copper in their hair.
233
Intelligent men tend to be more sexually faithful.
31
In the US, people can be rejected from joining the police force if they are too intelligent.
45
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8