Keystone XL Protest; How to Win; Idioms

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Protester displays a placard during the UN Climate Change conference in Durban.

Last weekend, thousands of protesters marched on Washington in opposition to the Keystone XL pipeline. Bill McKibben, environmentalist and founder of, talks about the protest. Plus: A new book explains the science behind winning and losing -- and how to do more of the former; and a series on the origins of idiomatic phrases.