The world’s first atomic weapon, codenamed “Gadget,” is raised atop the testing tower. Trinity Site, near Alamogordo, New Mexico, July 1945. How quickly this successful test became Fat Man and Little Boy and WWII was over.

The world’s first atomic weapon, codenamed “Gadget,” is raised atop the testing tower. Trinity Site, near Alamogordo, New Mexico, July 1945. How quickly this successful test became Fat Man and Little Boy and WWII was over.