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If you are using paper flashcards, it’s easy to flick through all of them if you only have 30 of them to review, but as the number grows to 300 or 3000, it quickly becomes unwieldy. He observed that we tend to remember things more effectively if we spread reviews out over time, instead of studying multiple times in one session.
It’s multi-platform, running on Windows, Mac OSX, Linux/Free BSD, and some mobile devices.It is a rather rough approach however, as it can’t give you an exact date on which you should review something again, and it doesn’t cope very well with material of varying difficulty.The biggest developments in the last 30 years have come from the authors of Super Memo, a commercial flashcard program that implements spaced repetition.If you went to a fantastic restaurant that day and spent the last two weeks telling people about how great it was, however, you’re likely to still remember in vivid detail.The brain’s “use it or lose it” policy applies to everything we learn.
Our brains are efficient machines, and they rapidly discard information that doesn’t seem useful.