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Earth built nuclear reactors before humans

Earth built nuclear reactors before humans

Around 2 billion years ago, Earth ran nuclear reactors. Uranium deposits at Oklo, in what is now Gabon, sustained natural fission reactions—long before humans existed.

Actual drill-core pieces from the ancient natural nuclear reactors at Oklo — Naturhistorisches Museum Wien. Original Oklo drill-core specimen photograph resized; scale retained.

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