Most everyone has a pretty good idea of what an atomic explosion looks like. Through images and video, we know the flash, the fireball, the mushroom cloud. Seeing it all in person is quite different, however. One of the few firsthand accounts immortalized to paper comes courtesy of the inimitable Richard Feynman, who was present for the very first detonation of a nuclear weapon. The test, codenamed "Trinity" was carried out on July 16, 1945 in the Jornada del Muerto desert of New Mexico. The 20-kiloton blast was the culmination of years of work by the scientists of the Manhattan...