If you've ever spent a day doing pretty much nothing but thinking hard and still wound up feeling worn out, you might have been a little embarrassed. After all, in 2018, Eliud Kipchoge of Kenya managed to run an entire marathon in two hours and a minute thirty nine. Compared to that kind of incredible human feat, can we really justify needing a break from just sitting around in deep thought? Well, yes. As reported in Current Biology on August 11, new research suggests an expl