Restricted DataThe first full history of US nuclear secrecy, from its origins in the late 1930s to our postCold War present. The American atomic bomb was born in secrecy. From the moment scientists first conceived of its possibility to the bombings of Hiroshima and Nagasaki and beyond, there were efforts to control the spread of nuclear information and the newly discovered scientific facts that made such powerful weapons possible. The totalising scientific secrecy