A failed retrieval attempt followed by feedback beats spending the same time reading.
The highest-yield technique in Part I and the one nobody does, because deliberately failing feels like wasting time. Skipping the feedback step cancels it entirely.
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example-of →Conditions that make learning feel harder tend to make it last longer — fluency is a misleading signal.The most counterintuitive instance of the principle, and the cleanest: the failure is not a cost paid before learning, it is the mechanism.