New discoveries are casting fresh light on the long-asked question of how the Giza Pyramids were built. We know that they were not built with slaves - there was a permanent workforce of skilled labour, but also a form of obligatory labour during times of the annual Nile flood when farm workers were unable to work the fields. Now, new evidence from desert stone quarries has emerged demonstrating how the Pyramids were constructed 4,500 years ago. Find out everything you need to know from Dr Karin Sowada, ARC Future Fellow in the Department of Ancient History at Macquarie University.