Uniting the States; Sculptor Richard Serra; Tea Party "Town Hall"; Mike Tyson

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Simon Winchester talks about the inventors, explorers, and thinkers whose work shaped early America and united the nation. Richard Serra discusses his monumental sculptures and his new show at the Gagosian Gallery. Directors Sierra Pettengill and Jamila Wignot on their documentary, “Town Hall, which follows two Tea Party candidates in Pennsylvania during the 2012 campaign season. Former heavyweight champion of the world, philosopher, and pigeon lover, Mike Tyson talks about his unlikely journey to and from the boxing ring.