This image from 1945 shows Manhattan Project physicist Harold Agnew smiling and holding the plutonium core of one of ... the heart of the "Fat Man" atomic bomb was detonated on August 9, 1945 ...
The Fat Man, a plutonium-centered implosion bomb, was over 10,000 pounds. But the nuclear core was only 13 pounds and about the size of an orange. Soldiers working on the bomb didn't need ...