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In August/September 2002, a group of 78 physicists from 50 laboratories in 17 countries met in Erice, Italy, to participate in the 40th Course of the International School of Subnuclear Physics. The purpose of the School was to focus attention on the theoretical and phenomenological developments in gauge theories, as well as in all the other sectors of subnuclear physics. Experimental highights from the most relevant sources of new data were presented and discussed, including the latest news on theoretical developments in quantizing the gravitational forces.

This volume constitutes the proceedings of the School. It is dedicated to the memory of Victor Frederick Weisskopf, a founder - together with John Stewart Bell, Patrick Maynard Stuart Blackett and Isidor Isaac Rabi - of the "Ettore Majorana" Centre for Scientific Culture, this School being the first of its 114 Schools now in existence.