I believe I read that Roman concrete was made from volcanic pumice. The exact manufacturing process has been lost. So many processes have been forgotten over time. How to make real Damascus steel, for example. Or ancient Chinese porcelain. Or Japanese cast iron art objects. I doubt very much if any iron foundry in the world could cast and shape and temper the massive gun barrels that were made in the Krupp Works in Germany for WW1 and WW2.
Today I have been repeatedly learning that poal has a lot of smart people in it.
That's because you're a faggot. The exact formula's for the German "gun barrels" were brought over under 'Operation Paperclip' as well as plenty of other professions and secrets. Heck, even the head of the Gestapo became POTUS Truman's assistant.
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