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CERN physicist and science broadcaster Brian Cox meets some of the celebrity enthusiasts of particle physics. He talks to Alan Alda and John Barrowman about their enthusiasm for the largest, most ambitious science experiment ever undertaken, CERN's Large Hadron Collider. He travels to CERN with former quantum physicist turned comedian Ben Miller, discusses the shape of the universe with ex-cosmologist Dara O Briain and ponders the validity of the big bang with Eddie Izzard.