How the Egytpians Built the Pyramids

/> Open Culture posted this video clip about the work of French architect, Jean-Pierre Houdin on the Great Pyramid at Giza. Using 3-D software, Houdin argues that  the Egyptians used an external ramp for the lower part of the pyramids and an internal ramp for the higher parts. Egyptologist Bob Brier summarizes Houdin's theory in this short article.