Amanpour: Vali Nasr, Karl Sharro, Julie Andrews and Ev Williams

Vali Nasr, professor of International Affairs at Johns Hopkins University, and Karl Sharro, the Lebanese-Iraqi satirist, join Christiane Amanpour to dissect the motivations behind the deadly protests in Iraq. Julie Andrews, the Oscar-winning actress best known for her iconic roles in "Mary Poppins" and "The Sound of Music," talks candidly about the highs and lows of Hollywood and penning her new memoir "Home Work." Our Walter Isaacson sits down with Ev Williams the co-founder of Twitter, to discuss his new publishing platform Medium and why he's focusing on more nuanced, quality content. He also digs into why Twitter needs to take more responsibility.

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