Self Knowledge

Before being allowed to light their for hire sign, London's taxi drivers must pass a series of rigorous exams to prove they have committed to memory every street, major building and open space within a 10-km radius of the city center and be able to recite a set litany of 320 routes or "runs" — in both directions. This feat of memory is so daunting that it is capitalized as "the Knowledge," and scientists have found that in order to accommodate such a vast mental map, the posterior hippocampus of a London cabbie's brain, the bit responsible for spatial memory and...

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