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Lecture given by Michel Spiro (CEA research director), on December 2, 2003, as part of the IAP public lectures. The image and sound quality of this video recording is not as good as it could be if it were made today, but its interest in the history of the dissemination of knowledge merits its presentation here, as an archive. See Michel Spiro's Wikipedia page: https://fr.wikipedia.org/wiki/Michel_...