"As far back as the Greeks and Romans, humans have documented the belief that there is a strong link between exercise and intelligence. But in the last two decades, neuroscience has begun to catch up with Thales and Juvenal’s idea that a sound mind flourishes in a healthy body. While the studies unite in telling us that running will makes us smarter, it is only partly true. The process is more complicated and reveals more about the wonderful complexities of both the human body and its evolution. Although the science might be helping us to understand how the mechanisms work, an important question remains: why does running make us smarter?"