Main Page | See live article | Alphabetical index Oklo is a place in the West African state of Gabon. It is famous as the locale of a number of sites at which self-sustaining nuclear fission reactions took place approximately 2000 million years ago. This fact was discovered in 1972 when measurements of the relative abundances of the two most significant isotopes of the uranium mined there showed an anomalous result compared to those obtained for uranium from other mines. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.