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Bill Gates, Microsoft Chairman and Co-Chair and Trustee of the Bill & Melinda Gates Foundation, takes part in a panel discussion titled ”Investing in African Prosperity” at the Milken Institute Global Conference in Beverly Hills, California May 1, 2013 (Credit: Reuters/Ruelas)

Bill Gates, Microsoft Chairman and Co-Chair and Trustee of the Bill & Melinda Gates Foundation, takes part in a panel discussion titled ''Investing in African Prosperity'' at the Milken Institute Global Conference in Beverly Hills, California May 1, 2013 (Credit: Reuters/Ruelas)