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The original was posted on /r/todayilearned by /u/TheMadhopper on 2024-02-19 19:46:14.

Original Title: TIL about the “Demon Core” a plutonium core of an atomic bomb designated to be the 3rd nuclear bomb dropped on Japan during WWII, but after Japan surrendered the core was used for research at Los Alamos National Labs in New Mexico where it was involved in two fatal accidents.