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Science correspondent Miles O'Brien plunged into a muck of that which rhymes with "it" to investigate our ailing sewage system. Here's his story of what happened underground. Don't miss his full report on tonight's NewsHour.

A river rises in the Andes and flows east to the Amazon, Ucayali River in Peru. Photo by Bates Littlehales/National Geographic/Getty Images TARAPOTO, Peru -- For tropical ecologist Gregory Asner, flying over the Peruvian Amazon from the town…