When the first atomic bomb, nicknamed "Little Boy," was dropped from the Enola Gay onto Hiroshima on the morning of August 6, 1945, the world changed forever. But the story started long before then, and here Edward T. Sullivan delves into all the advances that led to the making of the most destructive weapons ever invented: the scientific developments of the Manhattan Project, the massive commitment by the Western world to win the great nuclear arms race, and the contributions to the war effort big or small by all those involved. From bus driver to scientist to spy to the president, Sullivan examines all the key personalities concerned, including Albert Einstein, J. Robert Oppenheimer, President Roosevelt, and many more. The dropping of the bomb, as well as the complicated aftermath is also discussed. In this comprehensive book, featuring several arresting black-and-white photographs of the day, Sullivan offers a broad and compelling look at the atomic bomb and its pronounced effects on our world today.