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Douglas R. Hofstadter is College Professor of Cognitive Science and Computer Science at Indiana University, Bloomington, Indiana. His previous books are the Pulitzer Prizewinning Goedel, Escher, Bach Metamagical Themas, The Mind's I, Fluid Concepts and Creative Analogies, Le Ton Beau de Marot, and Eugene Onegin. Daniel C. Dennett is Distinguished Arts and Sciences Professor, Professor of Philosophy, and Director of the centre for Cognitive Studies at Tufts University.