“Electricity, indoor plumbing, telephones and the internet are just passing fads.”
I see that too. One of the best forms of knowledge to share right now before it is lost is how to heat treat stone for knapping.
Heat Treat Stone for Napping?
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If it gets to that point I’ll do it the Old Fashioned way— Blanket and Pillow.
You set the bar pretty low. How about knowing where iron ore an coal can be found, and how to refine it into steel? How about gaining access to printed ore survey maps? Maybe you could lay in chemistry, physics, biology, and medical books.
I think a lot about recovering from the ashes, and have some heavy duty books to prove it. It is better to think ahead about recovery than willingly return to the stone ages.