In 2000, the Proceedings of the National Academy of Sciences published the results of a by-now famous research study examining the brains of London taxi drivers who had navigated the city’s streets for years. The researchers found that the part of the taxi drivers’ brains that deal with spatial relationships—the hippocampus—had grown in size and contained a higher number of neural networks. Essentially, the taxi drivers had changed their brains by navigating London so much.
