As the Nazis intensified their intolerant racial policies, Bohr felt a moral obligation to speak out. Thus, when he was invited to address the International Congress of Anthropological and Ethnological Sciences, Bohr took advantage of the opportunity. Because of Denmark's tradition of neutrality, however, he could not make a public attack on Hitler. Instead, he chose his words carefully and made a scientific argument for cultural harmony and the advantages of accepting different backgrounds. While guarded, the meaning of his speech was clear, and Bohr's became one of the strongest European voices to confront the Nazis. At this conference Bohr managed to exchange a few private words with Fermi, who indicated his desire to leave Italy. As he was about to win the Nobel Prize, Fermi used this trip to Stockholm to escape to Copenhagen until he and his family could leave for the United States. Before Fermi left, the Fascist government had already announced his discovery of a
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