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COSMOS: A SPACETIME ODYSSEY: Oil companies used the research of Scientist Robert A. Kehoe to advocate for the use of lead in oil based products 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.