HackerDavid Deutsch: A new way to explain explanation
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David Deutsch 用四季解释说明什么叫细节不可随意替换。地轴倾斜的机制会约束两半球季节关系；任意改角色名就能保住结果的故事则很难用同样方式检验。
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That's a good explanation: hard to vary, because every detail plays a functional role.And the tilt also explains the sun's angle of elevation at different times of year, and predicts that the seasons will be out of phase in the two hemispheres.