Little Boy: The Atomic Bomb That Changed the World

In Little Boy: The Atomic Bomb That Changed the World, Stephen Carrington tells the story of the weapon that brought the destructive power of nuclear fission from the laboratory into warfare and permanently altered the course of human history. Born from the urgency of the Second World War and fears that Nazi Germany might develop an atomic weapon first, Little Boy emerged from an unprecedented convergence of scientific discovery, industrial power, military organization, and political decision-making. Its use over Hiroshima on August 6, 1945, helped bring the Pacific War toward its conclusion while opening an atomic age whose consequences continue to shape international affairs.

Drawing on wartime records, Manhattan Project documents, technical reports, and survivor testimony, Carrington traces Little Boy from the discovery of nuclear fission and the immense uranium-enrichment effort at Oak Ridge to its development at Los Alamos, preparation for combat, and the events surrounding Hiroshima. He examines the people and institutions behind the bomb, the human consequences of its use, Japan's final wartime crisis, and the extraordinary questions that confronted scientists and governments once nuclear weapons became a reality.

More than the history of a single weapon, this book explores the moment warfare crossed a threshold from which there could be no return. Little Boy existed only briefly as an operational weapon, yet its legacy can be found in nuclear deterrence, proliferation, arms control, scientific responsibility, and the continuing debate over Hiroshima. It remains one of history's most consequential weapons, a product of extraordinary human ingenuity whose creation forced civilization to confront the immense responsibility that comes with the power to destroy on an unprecedented scale.