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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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Clark Barrett ar Twitter: "@IanDunt Karl Popper's paradox of tolerance. We must tolerate everything exept the intolerant. Required reading with rise of alt-right https://t.co/Ey66mW0dam" / Twitter
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