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The Surprising Truth Behind the Construction of the Great Pyramids
Professor Michel Barsoum stands before one of the Egyptian pyramids for which he has found evidence suggesting some of the stone blocks were cast, not quarried.
Credit: Michel Barsoum, Drexel University
An egg-shaped cavity marked by the arrow spans two massive blocks on the north side of Senefru's Bent Pyramid must have been formed when the blocks were cast around a small rock or debris that was present.
Credit: Michel Barsoum, Drexel University
The top of the Khafra pyramid shows an intact outer casing near the apex and a band of regular stone just below.
Credit: Michel Barsoum, Drexel University
This colorized scanning electron microscope image shows the pyramid's "innercasing" limestone, including amorphous silica (red) that cements the limestone aggregates (black) together.
Credit: Michel Barsoum, Drexel University