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- Comment on In a First, America Dropped 30,000-Pound Bunker-Busters—But Iran’s Concrete May Be Unbreakable, Scientists Say 13 hours ago:
Egyptians stacked blocks of stone to build the pyramids.
Roman concrete was impressively strong.
Neither of them had steel-reinforced concrete.
Neither did Gothic cathedrals, which is why they needed flying buttresses.
Reinforced concrete as we know it today is a 19th century innovation, as I understand it.
en.wikipedia.org/wiki/Reinforced_concrete?wprov=s…
Maybe the commenter was thinking of adobe.