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As a geothermal scientist, Andrés Ruzo knew that boiling rivers exist-but they're always near volcanoes. You need a lot of heat to make that much water boil. They were working in the volcanic gap, a 950-mile stretch that covers most of Peru, where there hasn't been active volcanism for the past two million years. Yet they found the Shanaya, a name derived from "heated thing." His measurements averaged 190°-195°F. [Source: National Geographic]
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