Bill and Melinda Gates talk with The Verge's Walt Mossberg about the sixth anniversary of the Gates Foundation's Giving Pledge, which commits billionaires to give most of their wealth to charitable causes. They argue that many wealthy entrepreneurs underestimate their own ability to apply business innovation to philanthropy. Melinda Gates is currently focused on improving women's access to contraception, while Bill Gates says vaccination efforts in the Middle East will completely wipe out polio worldwide by 2017. He also discusses how he views recent advances in artificial intelligence: "The dream is finally arriving." 

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