The human brain is surely the most sophisticated data-processing machine in the world, except when it's not. In fact, in some ways our brains can be flat-out crude--like when they're dealing with matters of race.
Like all other animals, our species emerged in a world where there was critical value in distinguishing between members of your own tribe--who nurture you and protect you--and members of other tribes, who see you as a competitor for food and mates. Your very survival can turn on making this distinction quickly and reliably; as a result, the primal wiring that makes such discrimination possible is...
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