What are the biggest moral challenges we face today? We're joined by two people who have given a lot of thought to cultural challenges around the world, including poverty, racism, and the systematic oppression of women. Nick Kristof is a columnist for The New York Times, and his wife Sheryl WuDunn a former New York Times correspondent. They are authors of the new book ?Half the Sky: Turning Oppression into Opportunity for Women Worldwide,? and wrote the article in Sunday's New York Times Magazine, "The Women's Crusade."

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