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File:Karl Popper (1902-1994), Nr. 104 bust (bronze) in the Arkadenhof of the University of Vienna-2481.jpg - Wikimedia Commons
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File:Karl Popper (1902-1994), Nr. 104 bust (bronze) in the Arkadenhof of the University of Vienna-2483.jpg - Wikimedia Commons
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Flying Dervish on Twitter: "Karl Popper, the Paradox of Tolerance. https://t.co/G2udyrdQH1 https://t.co/zBUJajLzYQ" / Twitter
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