Eighty years ago, on Aug. 6, 1945, the United States dropped the first of two atomic bombs on Japan to force the unconditional surrender that ended World War II. The fearsome weapons were created by ...

Mr. Graff is a journalist, a historian and the author, most recently, of “The Devil Reached Toward the Sky: An Oral History of the Making and Unleashing of the Atomic Bomb.” The 80th anniversary last ...