The MOST Ancient had a level of Construction, Design, and Mastery over the physical world never seen since
(www.theancientconnection.com)
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The first pump capable of moving concrete was invented in 1930.
Saying “these structures were poured, not quarried” doesn’t actually answer any important questions. Nor is there evidence for it.
it's the Davidovits geoplymer theory, been around for a while https://www.geopolymer.org/faq/faq-for-artificial-stone-supporters/