Intelligent people have more zinc and copper in their hair.
233
Poor eyesight (myopia) is associated with higher IQ.
232
You can only remember 4 things at a time.
31
In the US, people can be rejected from joining the police force if they are too intelligent.
45
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8