Either work hard if you want to be a good PhD student or just be a genius

A short essay in Nature discusses how the relationship between the number of hours a PhD student works and academic success. I agree that working too many hours or trying to fit academics into a 9-to-5 schedule is counterproductive. Taking weekend trips to parks and museums are better for nudging good ideas out of a person's cranial crevices, and not sitting in front of the emailer or knocking one's head against the wall.