Human brawn may be the key to why human brains are so big, according to a new hypothesis linking exercise to the evolution of our oversize noggins.
The idea has yet to be thoroughly tested, but researchers writing in the journal Proceedings of the Royal Society B say that it's worth a deeper look. In fact, some evidence in mice and rats suggests that simply breeding the most athletic animals could create offspring with sharper minds.
To read the original article: Did Exercise Make the Human Brain So Buff? | LiveScience
