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1. Freud’s “hydraulic error”: Evolved urges can be of at least two types, either like those for food or for fighting. Hunger is hydraulic, building over time, needing regular relief. Freud favored this model, wherein repression or denial caused problems. But Pinker shows fighting isn’t hydraulic and could only be adaptive if strategically controlled and restricted to certain contexts. - http://bigthink.com/errors-we-live-by/better-models-of-our-nature