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We explore the fundamental problem of causal inference: When a school has to choose between two ways of teaching math, method A or method B, the question is simple: which one works better?
Imagine you want to know whether a new study app actually helps students learn better. You look at kids who already use the app and kids who don’t. The app users get higher scores. Does that mean the app caused the improvement? Not necessarily. Maybe the kids who chose
Physics contains exactly two time-asymmetric facts: the thermodynamic gradient and the collapse of the wave function. Everything else is direction-blind.