K.” By James Sturm James Sturm is the director of the Center for Cartoon Studies and the author, most recently, with Joe Sutphin, of a graphic adaptation of “Watership Down,” by Richard Adams.

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The brain is our body’s hungriest organ. It accounts for just 2 per cent of our weight, but burns an inordinate 25 per cent of the calories we eat. “That’s why it’s a concern that we don ...