List of  World's Billionaires 2010

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Carlos Slim Helu: Telecom tycoon who pounced on privatization of Mexico's national telephone company in the 1990s becomes world's richest person for first time after coming in third place last year. Net worth up $18.5 billion in a year. Recently received regulatory approval to merge his fixed-line assets into American Movil, Latin America's biggest mobile phone company. His construction conglomerate, Impulsora del Desarrollo y el Empleo, builds roads and energy infrastructure. Son of a Lebanese immigrant also owns stakes in financial group Inbursa, Bronco Drilling, Independent News & Media, Saks and New York Times Co. Newspaper outfit's stock popped in early March on talk he might buy a controlling stake; he denies the rumor. Donating $65 million to fund a research project in genomic medicine with American billionaire philanthropist Eli Broad

Bill Gates: Software visionary is now the world's second-richest man. Net worth still up $13 billion in a year as Microsoft shares rose 50% in 12 months, value of investment vehicle Cascade swelled. More than 60% of fortune held outside Microsoft; investments include Four Seasons hotels, Televisa, Auto Nation. Stepped down from day-to-day duties at Microsoft in 2008 to focus on philanthropy. Bill & Melinda Gates Foundation dedicated to fighting hunger, improving education in America's high schools, developing vaccines against malaria, tuberculosis and AIDS.