EmbedVideo(5417, 482, 304); Here's a little-known winter fact: Ski moguls, those tricky-to-navigate bumps on well-traveled ski runs, migrate slowly uphill. Moguls are formed by skiers on virtually all ski trails that are not mechanically flattened with grooming…

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.

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