This work reexamines standard interpretations of Egyptian pyramids and surrounding structures. More than 120 pyramids have been discovered in Egypt and an original burial has not been found in any of them. It's not logical, say the authors, to believe pyramids were tombs as it would have been impossible to get the pharaoh and the funerary objects inside after the structure was built. The authors also say that the Great Pyramid of Giza fits the profile of a closed cycle chemical laser.