How about London Black Cab drivers who learn "The Knowledge"? http://www.bbc.co.uk/news/health-16086233 http://www.bbc.co.uk/news/health-16086233 "Earlier stu

How about London Black Cab drivers who learn "The Knowledge"? http://www.bbc.co.uk/news/health-16086233 http://www.bbc.co.uk/news/health-16086233 "Earlier studies of the brain of the cabbie had already noted the increase in "grey matter" in the hippocampus, an area found at the base of the brain."