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To get the biggest bang for our buck we can study the big ideas from the big disciplines: physics, biology, psychology, philosophy, literature, sociology, history, and a few others. We call these big ideas mental models. Our aim is not to remember facts and try to repeat them when asked, the way you studied for your high school history exams. We’re going to try and hang these ideas on a latticework of mental models, with vivid examples in our head to help us remember and apply them.