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Download HD Season 2 Episode
- Season 1 Standing Up in the Milky Way
- Season 1 Some of the Things that Molecules Do
- Season 1 When Knowledge Conquered Fear
- Season 1 A Sky Full of Ghosts
- Season 1 Hiding in the Light
- Season 1 Deeper, Deeper, Deeper Still
- Season 1 The Clean Room
- Season 1 Sisters of the Sun
- Season 1 The Lost Worlds of Planet Earth
- Season 1 The Electric Boy
- Season 1 The Immortals
- Season 1 The World Set Free
- Season 1 Unafraid of the Dark
Cosmos - Season 1 Episode 7 The Clean Room
8.50 60 minutes To determine the true age of the Earth, geochemist Clair Patterson developed the uranium-lead dating method to make an unprecedented discovery – calculating Earth's age of 4.5 billion years. But Patterson's groundbreaking discoveries were just beginning. Patterson made it his mission to draw public attention to the detrimental effects of lead in the environment and dedicated his career to fighting against the petroleum and chemical industry, eventually achieving public health's biggest victory of the 20th century.
