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Bill Gates will 61 this Friday. He is the richest man in the world, with a valued at more than $80 billion, due to his vision for personal computer software at Microsoft. And thanks to that fortune, he is the most philanthropist in the world. The Bill & Melinda Gates Foundation, which he founded and along with his wife, allocates $5 billion a year to the fight against such as malaria, polio and AIDS, as well as driving agriculture reform in countries and other development initiatives. While drinking a can of Diet Coke, he questions for this early-morning interview with EL PAÍS in London, where he was spending the week at conference for his foundation about the major for the future in terms of global .