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I've always thought stack overflow could be the start of a model for an academic archive.

I think this is certainly true. Research papers are typically written so that a person with training in the field can understand and replicate the work. Note that the general population is not the intended audience. Mediums like news articles and blog posts are a more effective way of explaining the background and significance of a certain piece of research to the masses.

Yes, but that's still hard if half of those other researchers are on Librarian, and half of them are on Hypothes.is.