A study was conducted measuring the brain size of London cabbies. Why cabbies, why London, you might ask.
Cabbies have a very brain taxing job, despite what you may think. This may be even more so in a large city such as London. Cabbies must memorize the complex layout of the city and be able to figure out the fastest routes between thousands upon thousands of starting and ending points. They must do so quickly and under a certain amount of pressure. This study showed that the cabbies with the most experience, which would also be the most innovative because they have come up with all types of ways to innovate, were continuously challenging their brains so that they could survive in a very competitive industry. These cabbies had larger than normal right temporal lobes, ie bigger brains since they used them so often in so many challenging ways.
So if you want to grow a huge brain, and be extra intelligent, get a job as a London cabbie. But be sure to buy a new hat!!!