HEAD CASES: The physical phenotypic differences between this Sudanese skull (right) and this European skull (left) are apparent. (From J.L.A. de Quatrefages, E.T. Hamy, Crania ethnica: les Cranes des races humaines, Baillere et fils: Paris, 1882.) Henry Flower became director of the British Museum of Natural History in 1884, and promptly set about rearranging exhibits. He set a display of human skulls to show their diversity of shape across the globe. A century later, the skulls had gone, and in their place was a large photograph of soccer fans standing in their terraces bearing the legend: "We are all...