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COSMOS: A SPACETIME ODYSSEY: THE CLEAN ROOM – Host Neil deGrasse Tyson tells the heroic story of scientist Clare Patterson whose heroic search for the truth shows how a single person can change the world without ever committing a single act of destruction or violence in the all-new "The Clean Room" episode of COSMOS: A SPACETIME ODYSSEY airing Sunday, April 20 (9:00-10:00 PM ET/PT) on FOX and Monday, April 21 (9:00-10:00 PM ET/PT) on Nat Geo.