lastmomentsalive on Instagram: "On December 30, 1958, 38-year-old Cecil Kelley was working alone at Los Alamos National Laboratory. The tank he monitored was believed to contain only trace plutonium. It didn’t. When Kelley switched on the mixer, a vortex formed—pulling a hidden, concentrated layer of plutonium into the center. In seconds, the material reached critical mass. A brilliant blue flash filled the room. Kelley absorbed 3,900 rads of radiation instantly. He collapsed, telling coworkers