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Participants of the 8th International Congress of Philosophy in Prague (September 2–7, 1934). Front row: Gaston Bachelard (7th from left), Hans Driesch (8th from left), and Moritz Schlick (9th from left). Back row: Hans Reichenbach (2nd from right) and Rudolf Carnap (8th from right) © George Moritz H. van de Velde-Schlick