A tourist at the Bradbury Science Museum in Los Alamos, New Mexico, in February examines a full-size replica of the "Fat Man" atomic bomb which was dropped on Nagasaki, Japan, on Aug. 9, 1945. Los Alamos is home to the Los Alamos National Laboratory which was established in 1943 as part of the Manhattan Project. Robert Alexander/Getty Images hide caption

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Robert Alexander/Getty Images

Survivors of the first atomic bomb ever used in warfare are seen as they await emergency medical treatment in Hiroshima, Japan, in 1945. AP hide caption

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AP

After Hiroshima Bombing, Survivors Sorted Through The Horror

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Kikue Takagi, left, narrowly survived the Hiroshima atomic bombing as a schoolgirl. She's now 83. Her second cousin is U.S. Rep. Mark Takano, a Democrat from southern California. His grandparents and parents were all placed in U.S. internment camps in World War II. In this photo from last year, they are at a restaurant in Hiroshima, where he visited her. Courtesy of Mark Takano hide caption

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Courtesy of Mark Takano

Visitors shelter from the rain under the Peace Flame as they visit the Memorial Park and the nearby Hiroshima Peace Memorial Museum on April 21 in Hiroshima, Japan. The dome in the background was destroyed during the attack, and preserved as a monument. The park, museum and dome are dedicated to the victims of the world's first nuclear attack, and to the pursuit of peace. Carl Court/Getty Images hide caption

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Carl Court/Getty Images

President Obama bows as he greets Japanese Emperor Akihito and Empress Michiko at the Imperial Palace in Tokyo in 2009. The president travels to Japan next month and there's speculation he might visit Hiroshima, the site of the world's first atomic bombing. Charles Dharapak/AP hide caption

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Charles Dharapak/AP

Secretary of State John Kerry pauses during his remarks about seeing the Hiroshima Peace Memorial Park and Museum, the site of the 1945 atomic bombing, during a news conference at the conclusion of the G-7 Foreign Ministers' Meetings in Hiroshima on Monday. Jonathan Ernst/AFP/Getty Images hide caption

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Jonathan Ernst/AFP/Getty Images

Sumiteru Taniguchi, 86, a survivor of the 1945 atomic bombing of Nagasaki, walks up to deliver his speech at the 70th anniversary of the atomic bombing in Nagasaki, southern Japan, on Sunday. Eugene Hoshiko/AP hide caption

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Eugene Hoshiko/AP

Children offer prayers Thursday after releasing paper lanterns to the Motoyasu River, where tens of thousands of atomic bombing victims died, with the backdrop of the Atomic Bomb Dome in Hiroshima. Eugene Hoshiko/AP hide caption

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Eugene Hoshiko/AP

Japan's new warship, the Izumo, draws a crowd for its launch ceremony at the port in Yokohama Tuesday. At 248 meters (814 feet) in length, the flat-topped ship has been called a destroyer, or a helicopter carrier. Toshifumi Kitamura/AFP/Getty Images hide caption

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Toshifumi Kitamura/AFP/Getty Images