The Surprisingly Plausible Theory that the Pyramids were Poured from Ancient Concrete The Egyptian pyramids at Giza are among the most famous and storied monuments in the world. The oldest of the seven wonders of the ancient world – and the only ones still standing – they have awed and inspired travellers, scholars, poets, and artists for thousand of years. Yet despite this timeless fascination, relatively little is known about who built the pyramids or why. Few records survive of the pharaohs Khufu, Khafre, and Menkaure, and while the pyramids are assumed to be tombs, there is surprisingly little evidence of anyone actually being buried within them. Yet the greatest mystery of all is how the pyramids were actually built. The Great Pyramid of Khufu stands 146 metres tall, weighs 6 million tons, and is composed of nearly 2.3 million granite and limestone blocks weighing up to 80 tons each. Yet the structure is nearly perfectly level and square, the blocks so close-fitting that a piece of paper will not fit between them. And most astonishing of all, the work appears to have been completed in less 20 years. How such precision construction on such a massive scale could be completed so quickly by people possessing only bronze and stone tools is a question that has baffled egyptologists for centuries. While the obvious answer is, of course, as ever, Aliens, in 1974 a French geochemist named Joseph Davidovits forwarded a radical new theory- that the pyramid blocks were not cut, but