Today's Takeaways: Afghan Uncertainty, Space History, Big Data, Christmas Cards

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December 22, 2015: 1. Afghanistan: America's $17 Billion Boondoggle | 2. Big Data Elections: What Political Campaigns Know About You | 3. Elon Musk Makes Space History | 4. A Brief History of the Christmas Card | 5. Doctors Without Borders Director Looks Back on a Difficult Year