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On 25 September 1972, they announced that the depleted uranium had come from Gabon where nuclear scientists had discovered a 2 billion year-old nuclear reactor at the site of the Oklo uranium mines near a town called Franceville. This was a naturally occurring deposit of uranium where the concentration of uranium-235 had been high enough to trigger a self-sustaining nuclear reaction.
Today, say Edward Davis at Kuwait University and a couple of pals review the scientific history of the discovery at Oklo, one of the most extraordinary natural phenomena on the planet.
Since its discovery, the Oklo reactor has been a significant driver of important research in nuclear physics. In particular, physicists have used it to study how buried nuclear waste might spread through the environment. And since the reactor began operating some 2 billion years ago, they've also used it to study how the universe's fundamental constants may have changed during that time.
https://medium.com/the-physics-arxiv-blog/4472460b82c2