resrouce depletion

If our technological society collapsed tomorrow, what crucial knowledge would we need to survive in the immediate aftermath and to rebuild civilization as quickly as possible?

Ask yourself this: If you had to go back to absolute basics like some sort of post-cataclysmic Robinson Caruso, would you know how to recreate an internal combustion engine? Put together a microscope? Get metals out of rock? Or produce food for yourself? » Read more