Solved Problems Repository

Fol­low-up to: Bor­ing Ad­vice Repository

Many prac­ti­cal prob­lems in in­stru­men­tal ra­tio­nal­ity ap­pear to be wide open. Two I’ve been an­noyed by re­cently are “what should I eat?” and “how should I ex­er­cise?” How­ever, some ap­pear to be more or less solved. For ex­am­ple, var­i­ous mnemonic tech­niques like mem­ory palaces, along with spaced rep­e­ti­tion, seem to more or less solve the prob­lem of mem­o­riza­tion.

I would like peo­ple to use this thread to post other ex­am­ples of solved prob­lems in in­stru­men­tal ra­tio­nal­ity. I’m pretty sure you all col­lec­tively know good ex­am­ples; there’s a com­ment I can’t find from a user who said some­thing like “tak­ing a flat­ter­ing pho­to­graph of your­self is a solved prob­lem,” and it’s likely that there are other use­ful ex­am­ples like this that aren’t com­mon knowl­edge. Err on the side of post­ing solu­tions which may not be uni­ver­sal but are still likely to be helpful to many peo­ple.

(This thread is al­lowed to not be bor­ing! Go wild!)