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Memory is a tricky thing. Scientists have figured out how many units of information you can store in your short-term memory (around seven, though there are great workarounds for remembering more than that), but if you really want to remember something, you have to go over it a bunch of times until it lodges deeper in your brain.

There are quite a few ways to do that if you have some time to devote to the practice of repetition, but if you’re getting ready for a test at school or a presentation at work, you might not have too long to go over the content again and again and again—but you do, if you make a personal podcast.

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