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Back to the Stone Age

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Photo: Doomsday preppers practice shooting

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Phoenix, Ariz., dad Tim Ralston is prepared for an electromagnetic pulse attack on America. He's built a shipping container specially outfitted for survival purposes and taught his sons to defend the compound with weapons.Jason Charles is a New York firefighter preparing for the eruption of the Yellowstone super volcano. He's storing meals ready to eat and water in his city apartment.

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