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
People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
13
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