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about the Demon Core, a spherical 6.2 kg. mass of plutonium intented to be a third nuclear weapon against Japan. After Japan surrended, it was kept in the US where it caused the death of two Nuclear Physicists.

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Fun Fact: about the Demon Core, a spherical 6.2 kg. mass of plutonium intented to be a third nuclear weapon against Japan. After Japan surrended, it was kept in the US where it caused the death of two Nuclear Physicists.

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en.wikipedia.org

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