The updated edition of this essential collection of historical texts by prominent scientists and historians who witnessed the birth of the modern nuclear age now includes President Barack Obama's 2016 statement at Hiroshima, new accounts from Japanese atomic bomb survivors, and a new foreword by Cynthia C. Kelly.

The development of the atomic bomb stemmed from a small research program that began in 1939 and would eventually employ more than 130,000 people, costing nearly 2 billion dollars, operating entirely under a veil of secrecy. This groundbreaking collection of essays, articles, documents, and excerpts from histories, biographies, plays, novels, letters, and oral histories has been renewed on the occasion of the 75th anniversary of the Hiroshima and Nagasaki bombings.

It includes the views of survivors (hibakusha) as well as the mayors of Hiroshima and Nagasaki. Also included are texts by and about J. Robert Oppenheimer, Leo Szilard, Albert Einstein, Richard Feynman, Leslie Groves, Klaus Fuchs, Henry Stimson, Harry S Truman, Vannevar Bush, Niels Bohr, and many other significant figures and authors such as Joseph Kanon, Jennet Conant, Kai Bird, and Martin Sherwin.

The Manhattan Project is the most comprehensive exploration of the creation of the atomic bomb available today.