I met Manuel in a European project in the early 2000's. Besides being a first class researcher admired by all of us, he was an extremely friendly person, easily accessible to all, with much attention to young researchers and students. I remember long exchanges on our common field of interest : epistemology and the evolution of technologies, where he had significant contributions as an historian and an editor. Meeting casually Manuel in conferences was always a great pleasure. I am extremely sad that this will not happen again.
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