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
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
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17