Some data on the shape of the forgetting curve
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The forgetting curve is often schematically pictured like this, as on Wikipedia:Learners often take this to mean that their retention of a given fact will, over time and on average, tend to look something like that. So, for example, the Wikipedia entry on Ebbinghaus glosses it as "describ[ing] the exponential loss of information that one has learned." But:Ebbinghaus's original forgetting curve is defined in terms of "savings," a metric we tend not to use: it describes how long it takes to learn
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