Our guest is Colin Dickey, author of "Cranioklepty," which explores the fascinating history of Phrenology, a prominent pseudo- science in the 18th and 19th centuries, which involved the analysis of human skulls in the belief that such study would reveal secrets relating to genius and greatness - and the astonishing lengths to which some Phrenologists went to secure the skulls of such legendary figures as Mozart and Haydn.