I've seen nothing but good about the practice of 'spacing' - that is, teaching something, and then following up after intervals of time to conduct 'retrieval' activities requiring the original content. "An optimal gap should be long enough that information is actively and successfully retrieved from memory, but not so long that nothing can be retrieved." It makes sense to me - it's an application of "use it or lose it". And it underlines why practice is important after you've been shown something. But I'd like to think we can use it for something more imaginatibve than mere memorization of facts.
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