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Season 7, episode 16. Keep your place, move between servers, and stay ready for the next episode.
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The Water Crisis
Water, water everywhere...but just how useful is it? NOVA travels to the Adirondack Mountains where acid rain is killing many high elevation lakes; to the Mississippi River where chlorine has combined with natural and manmade organic chemicals to form cancer-causing toxic chemical substances; to California, where conservation recycling has had to become a way of life; and to Bedford, Massachusetts, where the town wells have been contaminated by industrial waste.
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Episode 1: The Elusive Illness
Episode 2: A is for Atom, B is for Bomb
Episode 3: Living Machines
Episode 4: Portrait of a Killer
Episode 5: Umealit: The Whale Hunters
Episode 6: The Safety Factor
Episode 7: A Mediterranean Prospect
Episode 8: Mr. Ludwig's Tropical Dreamland
Episode 9: The Pinks and the Blues
Episode 10: The Cancer Detectives of Lin Xian