The Conversation: What's Behind the Success of 'Avatar'?

On Sunday, James Cameron's 3-D film epic "Avatar" grossed over $1 billion worldwide, making it only the fifth movie in history to do so. Today, ABC's Diane Sawyer asks staff members at World News to give their thoughts on the movie: why are people worldwide flocking to see this film? What was most memorable about it? All this and more in today's Conversation. Full Story
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