How can you grow your brain? You can always follow the example of London taxi cab drivers and memorize a labyrinth of 25,000 city streets as well as thousands of tourist attractions and hot spots.
While many major cities try to simplify driving by arranging streets in user-friendly grids (or identifying streets by sequenced numbers or alphabetized names), London’s streets are particularly random. The maze of streets requires a unique approach for men and women who want to make a living navigating the confusing tangle. To earn their licenses, cab-drivers-in-training spend four years riding around the city on a moped, memorizing streets and routes. Even then, the licensing test is so difficult that only about half of these drivers-in-training actually pass.