For questions regarding the concepts (e.g., happy, sad, angry) that we use to describe the changes in cognition, behavior, and experience that occur in response to physiological and environmental stimuli.

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Why do difficult-to-learn subjects seem easier in retrospect?

Background: I have recently noticed that in class, that after I finished a unit, it seems less difficult than I expected it to be. It has happened in math, physics and electronics. Is it possible ...