In 1972, scientists examining uranium ore from a mine in Oklo, Gabon, noticed something strange. The ratio of Uranium-235 (the specific isotope used for fuel) was lower than normal. It looked like someone—or something—had already used the fuel. After investigating, they realized they had stumbled upon the only known natural nuclear reactor in Earth's history. About 1.7 billion years ago, conditions in this specific spot in Africa were perfect. The uranium deposits were rich enough, and groundwat

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Special Operations Soldiers are testing a new automatic activation device which will minimize risk when conducting Airborne Operations. Learn how to experience new tech like this first-hand at https://go.usa.gov/xSCfp. 📷: Jim Finney | GoArmy