Why was Roman Concrete Forgotten during the Middle Ages?
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For most of the same reason that most of what preceded it was forgotten and had to be re-invented like optical lens and large ship construction. Muslims.
Islam didn’t start for a coule if hindred years or so after Rome fell.
I never knew they had concrete back that far. If you search concrete and Thomas Edison you’ll find he is credited with introducing Portland Cement to the U.S.A. in the late 1800s. It’s all over the place, including a mention of it at his winter home in Ft. Myers, FL.
They probably had a lockdown pandemic that made most of the population stupid in less than a year.
I was going to say environmentalists....but muslims is the correct answer.
torching the library at Alexandria wasn’t a good thing the ‘slims did? Who knew.