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Several million years ago, natural selection equipped us with binary, black-and-white brains. Though the world was arguably simpler back then, it was in many ways much more dangerous. Not coincidentally, the binary brain was highly adept at detecting risk: the ability to analyze threats and respond to changes in the sensory environment -- a drop in temperature, the crack of a branch -- was essential to our survival as a species. Since then, the world has evolved -- but we, for the most part, haven't. Confronted with a panoply of shades of gray, our brains have a tendency to "force quit:" to sort the things we see, hear, and experience into manageable but simplistic categories. We stereotype, pigeon-hole, and, above all, draw lines where in reality there are none.