Intelligent people have more zinc and copper in their hair.
233
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
You can only remember 4 things at a time.
31
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