I think there's at least a few kinds of research that involve old ideas. The one I try to do is, go back in time to back when people knew certain things people don't know anymore, and combine those things with stuff they didn't know back then to do things that are interesting right now.

Another kind is where you just take 1980s stuff verbatim and (perhaps innocently) pretend you invented it. I am seeing several PL groups literally speed-running the 1980s right now and it is so weird...

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