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In Gabon, Africa is a strange geologic phenomena. Approximately 1.7 billion years ago, a natural nuclear reactor formed without any human intervention at what is now the Oklo Mine. 

nuclear%20reactor%20africa.jpg

It formed due in part to an unusually dense uranium deposit alongside a consistent supply of groundwater. Thus, for several hundred thousand years, a natural fission reaction took place. 

This video, made by a geologist who is based in Arizona, will discuss this fascinating geologic oddity.

 

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