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"Twelve million years ago, rhinos, elephants, and giraffes roamed North America. They would gather at nearby watering holes-eating, drinking, and trying not to become someone else's lunch. But one day, in what we now know as Nebraska, everything changed. The explosion of a supervolcano a thousand miles away sent a blanket of ash that buried these animals for millennia. Until 1953, when a seventeen-year-old farm worker made an unbelievable discovery....
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