HIROSHIMA, Japan (AP) — When the United States dropped the atomic bombs on the Japanese cities of Hiroshima and Nagasaki in August 1945, Ari Beser’s grandfather was on board both of the American B-29 bombers that carried the weapons. On the ground, Kosuzu Harada’s grandfather survived both attacks.

Neither of the men — U.S. radar specialist Jacob Beser and Japanese engineer Tsutomu Yamaguchi — met during their lives. But both became staunch advocates of nuclear abolishment.

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