From a
c|net story about how London cabbies are for the most part turning downs offers of GPS navigation systems comes this enticing factoid about the test of "The Knowledge," the routes of London, required to get a taxi license:
The test is so tough--it can take up 34 months of study, albeit part-time, to pass--that academic studies have shown part of the brain of successful applicants actually enlarges.
Scientists found London taxi drivers have a larger hippocampus, the part of the brain associated with navigation, than other people.
