The first collection ever of the writings and insights of the original creators of the atomic bomb, along with pieces by the most important historians and interpreters of the subject, is now in paperback. Born out of a small research program begun in 1939, the Manhattan Project eventually employed more than 130,000 people, including our foremost scientists and thinkers, and cost nearly $2 billion'”and it was operated under a shroud of absolute secrecy. This groundbreaking collection of documents, essays, articles, and excerpts from histories, biographies, plays, novels, letters, and the oral histories of key eyewitnesses is the freshest, most exhaustive exploration yet of the topic. Compiled by experts at the Atomic Heritage Foundation, the book features first-hand material by Albert Einstein, Leslie Groves, J. Robert Oppenheimer, Leo Szilard, Enrico Fermi, Richard Feynman, Niels Bohr, Henry Stimson, and many others. Dozens of photographs depict key moments and significant figures, and concise explanatory material accompanies each selection. The project's aftermath and legacy are covered as well, making this the most comprehensive account of the birth of the atomic age.