Intelligent people have more zinc and copper in their hair.
233
Intelligent men tend to be more sexually faithful.
31
Dolphins have names for one another.
18
Poor eyesight (myopia) is associated with higher IQ.
232
In the US, people can be rejected from joining the police force if they are too intelligent.
45
The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
264
People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
13