Intelligent people have more zinc and copper in their hair.
233
Poor eyesight (myopia) is associated with higher IQ.
232
Awarding people money for doing well in IQ tests causes them to score better, $10 increased people's score by an average of more than 20 IQ points. IQ tests don’t just measure intelligence - they also measure effort.
9
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
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
Dolphins have names for one another.
18
The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
264