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
Dolphins have names for one another.
18
Forty percent of American adults cannot fill out a bank deposit slip correctly.
155
Poor eyesight (myopia) is associated with higher IQ.
232
The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
264
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
There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
8
Intelligent people have more zinc and copper in their hair.
233