The spacing effect (and spaced repetition tools) are a "hack" to this: by being prompted to review an item just as you're about to forget it, you use more menta

The spacing effect (and spaced repetition tools) are a "hack" to this: by being prompted to review an item just as you're about to forget it, you use more mental effort – and then remember it better. This allows you to minimize effort while maximizing retention. https://en.wikipedia.org/wiki/Spacing_effect https://en.wikipedia.org/wiki/Spacing_effect