Sixty years ago, US President Harry Truman ordered the dropping of the atomic bomb on Hiroshima. It was a weapon of unprecedented power, and one that changed the face of warfare and international politics forever. On August 6, 1945, lessons begin at the National Technical University on the outskirts of downtown Hiroshima, as always, at 8 a.m. Math is first up in the lesson-plan for the day, and Keijiro Matsushima is gazing out the window, bored. The lanky, fatherless 16 year-old is the only member of his family still in Hiroshima: His brothers are off with the Imperial Navy fighting...