Haunting re-discovered photos of the mushroom cloud lingering over Hiroshima in the moments following the bombing on 6 August 1945. Originally thought to show the scene 30 minutes after the bombing at 8:15 am, The Atlantic's Rebecca Rosen talks to a nuclear historian who puts the shot as within 2-5 minutes of detonation.
Operation Castle Romeo | first test of the TX-17 thermonuclear weapon (initially the "emergency capability" EC-17), the first deployed U.S. thermonuclear bomb. The so-called "runt" device was a weaponized "dry" fusion bomb, using lithium deuteride fuel for the fusion stage of a "staged" fusion bomb, unlike the cryogenic liquid deuterium of the first-generation Ivy Mike fusion device. March 27, 1954