Bill and Melinda Gates Foundation co-chair Melinda Gates answers a question during an interview with the Associated Press at the foundation's headquarters in Seattle Tuesday, Nov. 5, 2013. Gates gave

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Bill and Melinda Gates Foundation co-chair Melinda Gates answers a question during an interview with the Associated Press at the foundation's headquarters in Seattle Tuesday, Nov. 5, 2013. Gates gave the U.S. public school system a C-plus. (AP Photo/Stephen Brashear) less 

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Associated Press
Fri, Nov 8, 2013 12:21 PM EST