Participants: Yves Coppens, French Paleontologist and Paleoanthropologist, Honorary Professor at the College de France; Laurent Lafforgue, Professor at the Institut des Hautes Études Scientifiques, France; Christopher Impey, University Distinguished Professor and Deputy Head of the Department of Astronomy at the University of Arizona, USA. Introduced by Marco Bersanelli, Professor of Astrophysics at the University of Milan.