U.S. President Barack Obama lays a wreath at Hiroshima Peace Memorial Park in Hiroshima, western, Japan, Friday, May 27, 2016. Obama on Friday became the first sitting U.S. president to visit the site of the world's first atomic bomb attack, bringing global attention both to survivors and to his unfulfilled vision of a world without nuclear weapons. (AP Photo/Shuji Kajiyama)
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