Hahn followed Haber to work on gas warfare. So did the physicist James Franck, head of the physics department at Haber’s institute, who, like Haber and Hahn, would later win the Nobel Prize.342 So did a crowd of industrial chemists employed by I.G. Farben, a cartel of eight chemical companies assembled in wartime by the energetic Carl Duisberg of Bayer.343 The plant at Leverkusen with the new lecture hall turned up hundreds of known toxic substances, many of them dye precursors and intermediates, and sent them off to the Kaiser Wilhelm Institute for Physical Chemistry and Electrochemistry for
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