Joseph Davidovits is a French materials scientist who has posited that the blocks of the Great Pyramid are not carved stone but mostly a form of limestone concrete. He holds the Chevalier de l'Ordre National du Mérite (one of France's highest honors), is the author and co-author of more than 130 scientific papers and conferences reports, is the discoverer and inventor of the geopolymer chemistry and its technical applications and holds more than fifty patents. Joseph is a member of the International Association of Egyptologists. He presented several conferences on ceramics, blue faience, cements, pigments, and the analysis of pyramids stones at several International Congresses of Egyptology. In this program, Joseph will discuss how the pyramids of Egypt were built. He'll share his research and theories about reconstituted limestone and more. Topics Discussed: geopolymers, casting stones, alchemy, stone paste, chemistry, minerals, concrete, wet sand, casting, quarries, disaggregated limestone, salt, natrium, sodium carbonate, caustic soda, casing stone, shells, silica, granite, pyramids under water, dating, humidity inside the pyramids, Zahi Hawass, current conditions in Egypt, salt in the pyramids, 60 million year old bedrock fossils, Gantenbrink's Door, Imhotep, Saqqara, bent pyramid, Dahshur, red pyramid, calcium, Cheops, bread making, palm trees, desertification, Amenhotep, Hapu.