Wednesday marks 50 years since President Lyndon Johnson signed the landmark Civil Rights Act, outlawing discrimination based on race, ethnicity and sex. Gwen Ifill is joined by Todd Purdum to discuss his new book, "An Idea Whose Time Has Come,"…

Can we reconcile the advancements of our modern world with Plato’s philosophical questions of free will? In “Plato at the Googleplex,” author Rebecca Goldstein imagines how Plato would approach neuroscience, the Internet and other technologies that make philosophy obsolete to…

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