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      Spaced repetition is really interesting, and there’s probably room for innovation in this space. What about using ML to generate “distractor” answers for multiple choice questions? Or social features so you can see how hard a question is for other users? Or VR so you can assign facts to physical locations in a “room” to make them easier to remember? There are only a few pieces of software in this space, and they’re all pretty old at this point so they don’t have these kinds of features.

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        Or VR so you can assign facts to physical locations in a “room”

        A VR Memory Palace! Yes! Although apparently that technique is more specifically for recalling things in sequence, like the points of a speech or the plot of a story.

        A voice interface to this software could be great too. Being able to say “Hey Cicero, I want to remember that the German word for ‘apple’ is ‘apfel’” or having Cicero randomly wake up and ask you questions during the day.

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        There’s definitely room for innovation in all these spaces, but (and maybe this is just a personal preference) I find that I like the the simplicity of current approaches. e.g. with Anki I’ve found that it can be used on old and/or resource constrained devices (which VR question generation might not be able to).

        About multiple choice questions, I can’t remember exactly where the paper is, but I did see one suggesting that in order of effectiveness free recall was better than multiple choice which was better than close deletions which in term were better than merely being shown the answer periodically.