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Killer Floods Preview
All over the world, scientists are discovering traces of ancient floods on a scale that dwarfs even the most severe flood disasters of recent times. What triggered these cataclysmic floods, and could they strike again? In the Channeled Scablands of Washington State, the level prairie gives way to bizarre, gargantuan rock formations.
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Find out why deadly flash floods are on the rise and how we can protect ourselves from them.
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Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.