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,"…

In 2007, photographer Myra Green had just finished “Character Recognition,” a collection of images of her face printed through a historical photographic process called ambrotype on black glass. The project sparked a conversation with one of her friends about race.

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