FILE - In this Sept. 27, 2013 file photo, the Comprehensive Nuclear Test Ban Treaty, CTBTO, Executive Secretary Lassina Zerbo speaks during a news conference during the 68th session of the United Nations General Assembly at U.N. headquarters. During an interview, Saturday, Sept. 28, 2019, Zerbo has said that in his "wild dreams" very young children around the world will be taught that nuclear testing isn't good _ and that the world should be free of nuclear weapons. (AP Photo/Jason DeCrow, file)
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