This week I’ve been writing a TV script about one of the great mysteries of ancient history: the Great Sphinx of Giza. Who built the Great Sphinx? What was it supposed to represent? And why, 4,500 years later, are archaeologists and historians still arguing about it? It’s a subject I know pretty well. In fact, one of the first archaeology films I ever made for television, nearly thirty years ago, asked many of the same questions. Which raises another mystery: why on earth are