It weighed some 65 tons, so heavy that it recalled Oppenheimer’s joke that if we needed to use the Super in war, we would have to deliver it by oxcart. It yielded some 10.4 million tons of TNT, or a force a thousand times greater than the Hiroshima bomb. Leona Marshall Libby, a witness to the explosion, wrote of it: “The fireball expanded to three miles in diameter.
