Intelligent people have more zinc and copper in their hair.
233
Dolphins have names for one another.
18
Forty percent of American adults cannot fill out a bank deposit slip correctly.
155
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
Poor eyesight (myopia) is associated with higher IQ.
232