Bernard d"Espagnat. Our think tank on the contributions of contemporary physics to the theory of knowledge begins its second year of existence and I have the pleasure of welcoming among us Alain Aspect and Michel Le Bellac who have come to listen to Franck Laloë in order to learn more about the theory of Louis de Broglie and David Bohm. It goes without saying that we are grateful for their presence and we would be delighted to welcome them again.