Political scientists often wonder what makes someone liberal versus conservative. Fortunately, there are several well-studied clues to predicting individuals’ political attitudes. For example, disgust sensitivity, which refers to how easily you are repulsed by gross things, increases the likelihood that you call yourself a conservative and vote for conservative politicians.1 How do the researchers explain this effect? The emotion of disgust may have evolved in part to help humans avoid poisonous or diseased substances (that’s why dog crap smells so foul to us) and we also generally associate immoral behavior with feeling disgusted. When people feel disgusted, they also express harsher, condemning attitudes toward social behaviors they feel are immoral (like incest). Conservatives, who happen to be more easily disgusted in general, also have more critical perspectives on stigmatized social behaviors (like same-sex sexual contact).