How do we know Egyptian pyramids were not build from a form of concrete? | Hacker News

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dukeofdoom 69 days ago | parent | context | favorite | on: How Has Roman Concrete Lasted for Millennia? 1,900...

How do we know Egyptian pyramids were not build from a form of concrete?

thekid314 69 days ago [–]

Because they are solid stone carved from the mountains south of Cairo, near modern day Helwan.

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