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The Surprising Truth Behind the Construction of the Great Pyramids
![Photo of a man in front of one of the pyramids](/news/mmg/media/images/barsoum_pyramid_f.jpg)
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
![Close up photo of blocks with an arrow pointing to a cavity.](/news/mmg/media/images/barsoum_stone_blocks_f.jpg)
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
![Photo of the top of the pyramid](/news/mmg/media/images/barsoum_khafra_f.jpg)
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
![image from scanning electron microscope](/news/mmg/media/images/barsoum_map_f1.jpg)
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