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The original was posted on /r/todayilearned by /u/The_Techsan on 2024-11-21 01:39:29+00:00.

Original Title: TIL The only known naturally occuring nuclear fission reactor was discovered in Oklo, Gabon and is thought to have been active 1.7 billion years ago. This discovery in 1972 was made after chemists noticed a significant reduction in fissionable U-235 within the ore coming from the Gabonese mine.