thumb|The natural nuclear fission reactors of Oklo:
thumb|The natural nuclear fission reactors of Oklo:
Oklo is a geological region near Franceville in the Haut-Ogooué Province of Gabon. Several natural nuclear fission reactors were discovered in the uranium mines in the region in 1972.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).