Bill Gates Opens The Annual Paris Solidays Festival, 3-day Music Festival To Fight AIDS [Getty Images]

PARIS, FRANCE - JUNE 26: Bill Gates, the co-Founder of the Microsoft company and co-Founder of the Bill and Melinda Gates Foundation visits the Solidays festival, on June 26, 2015 in Paris, France. Bill Gates visited the 17th edition of the Solidays music festival, dedicated to the fight against AIDS. (Photo by Chesnot/Getty Images)

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