A 1988(!) paper on the failure of educators to use the spacing effect: http://andrewvs.blogs.com/usu/files/the_spacing_effect.pdf … Interesting because:pic.twitter.com/ByvoRfIPWw
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In some ways that's not surprising - evidence is often very weak. This is an instance where that's not the case, though.
This is an interesting caution: https://www.math.upenn.edu/~wilf/website/PSUTalk.pdf … Over-stated at a few points, but many of the criticisms seem useful.