Spaced repetition review (my entry)

As people have likely forgotten, jsalvatier had generously set up a contest to look through the literature on the spacing effect. Duke submitted his entry a while ago, and I turned mine in on the 1 August deadline. It’s part of my overall essay on spaced repetition: gwern.net/​Spaced repetition#literature-review

There’s a lot of research, and I only cover what I estimate to be 0-5% of the extant literature, so if you’re interested only in the punchline: gwern.net/​Spaced repetition#review-summary

(This is only a pointer to the review because the formatting would drive me nuts on LW. I’m not sure the edit box even supports footnotes at all; nor do I intend to find out.)