Concrete
Patented: History of Inventions
00:00
The Pyramids of Kufus
There's no concrete in the pyramids as far as I know or anything like it. The pyramid of kufus costs somewhere around 78 million days of human labor which is cheaply available to someone who rules an area of fertile land. Any seven modern Americans in an average American lifetime and average American energy use will get through more than the amount of energy it costs to build the Kufus pyramids.
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