Next Step for the Keystone Pipeline

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Oil pipelines are laid down every day, but the one called Keystone XL has become a test of President Obama's environmental legacy. What are the possible consequences for climate change and the economy? Will he make a decision before the midterm elections? Could that determine who controls the Senate? Also, Microsoft's new CEO and one of tech's toughest jobs, and Facebook's tenth anniversary. We hear what Mark Zuckerburg has in mind for the future.