"Men cannot think like dogs.... [There exists] a sharp difference in the mental capacity of humans and canines. For example, a human who is given an intricate problem will spend all day trying to solve it, but a canine will have the sense to give up and do something else instead."

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There were studies that asked people in different cultures to draw pictures of their enemies, and the pictures all looked remarkably the same. They always had exaggerated canine teeth and a certain sort of expression. That led to speculation about whether at an earlier stage in the human experience we were hunted by some sort of carnivore.

— Jaron Lanier