On August 6, 1945, at 08:16:02 an explosive charge of more than 15 kilotons fell on the city of Hiroshima. Tens of thousands of people were pulverized and everything within 12 square kilometers was instantly destroyed. A deluge of flames and ash had just caused Japan’s greatest trauma, and probably that of the history of modern warfare. The whole world is horrified by the discovery of the existence of the most destructive manmade weapon ever invented: the atomic bomb.But how could such an appalling tool be invented? To answer this question, the authors return to the origins of its main component, uranium, and shed light on the scientific discoveries around this element and their uses both civilian and military. They have created a collaborative non-fiction work of the stories of men and women who are at the crux of History and narrated by its main protagonist, uranium.