Exo Explorer on Instagram: "The demon core was a plutonium sphere involved in two fatal radiation accidents during scientists' testing as a fissile core for an early atomic bomb. It was created in 1945 by the Manhattan Project, the U.S. nuclear weapons development program during World War II. Intended for shipment to the Pacific Theater as part of a third nuclear weapon for use in Japan, the core was retained for testing and potential future use after Japan's surrender. ☢️💥💀 Two criticality ac