

Do we have surviving scientists and engineers, or books? Then everything is easy-ish: Progress took time because we didn’t know anything, everything was trial and error. Now we know the correct forms of physical laws or their usable approximations so rebuilding is just a matter of time (generations maybe).
If somehow the collective wisdom is lost, back to the stone ages with you.
edit: High school education brings you to the 1920s tech (era of elements and alloys, just before composites) so maybe if we have any surviving adults, you can have glasses?
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