Bill and Melinda Gates Answer Your 'Toughest Questions' [WATCH]

To mark the 10th year of their annual letter, Bill and Melinda Gates are answering 10 tough questions that people ask of their foundation, saying: "We will answer them as forthrightly as we can, and we hope that when you're finished reading, you'll be just as optimistic as we are."



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Bill and Melinda Gates have released their 10th Annual Letter, and they're marking the occasion by answering 10 tough questions that people ask.