Were the Pyramids Made With Concrete?

" Concrete one was spilled to construct great pyramids approximately 5,000 years ago, according to the controversial investigation, that suggests the old Egyptans predated the Romans by thousands of years as the inventors of the concrete one. Michel Barsoum, professor of materials who directs in the university of Drexel in Philadelphia, and colleagues disclose in the present application the newspaper of the society of American ceramics that the pyramids were constructed with a combination of stones and blocks carved of the concrete one stone-based. "

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