In "Cosmos: A Spacetime Odyssey" episode 7, titled "The Clean Room", the story focuses on geochemist Clair Patterson and his groundbreaking discovery of the Earth's true age using uranium-lead dating, while also highlighting his relentless campaign against the widespread lead contamination in the environment, particularly from leaded gasoline, which he fought against despite significant industry opposition; the "clean room" title refers to Patterson's meticulous efforts to eliminate lead contamination in his laboratory to achieve accurate results. br br Key points about the episode:br 1. Central figure: Clair Patterson, a scientist who dedicated his life to uncovering the true age of the Earth and fighting against lead pollution. br 2. Scientific discovery: The use of uranium-lead dating to accurately determine the Earth's age. br 3. Environmental impact: The detrimental effects of lead poisoning, especially from leaded gasoline, and Patterson's fight against its widespread use. br Thanks for watching. Please follow for more videos.