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Actor Mark Ruffalo became an anti-fracking, clean water activist after seeing the technologies' detrimental impact on communities in Pennsylvania.
Charles Murray talks about his book, "Coming Apart: The State of White America, 1960 to 2010," and suggests a way to address the growing division between the classes.
Peter Beinart discusses his book "The Crisis of Zionism" and what he sees as a divide between the democratic Israel and the Israel of the West Bank.