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Sometimes defining an iron rule or governing idea and reorganizing our understanding of the world around it can be immensely revealing. Einstein developed the special theory of relativity from an assumption that the speed of light in a vacuum is unwaveringly constant. The most surprising results follow from that. Darwin showed that a simple mechanism, variation and natural selection, could explain much of the astonishing complexity of the natural world. Governing ideas are found everywhere: supply, demand and prices in economics; innocent-until-proven-guilty in criminal justice; [...]