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Billionaire Carlos Slim, left, speaks while Bill Gates listens during... Foto di attualitàAgricoltura,America del Nord,Ascoltare,Beneficenza,Bill Gates,Carlos Slim,Composizione orizzontale,Conferenza stampa,Continente americano,Fattoria,Finanza,Lettera maiuscola,Mass Media,Messico,Parlare,Ricchezza,Stati Uniti d'AmericaPhotographer Collection: Bloomberg 2013 BloombergBillionaire Carlos Slim, left, speaks while Bill Gates listens during a news conference to announce donations to Mexico's International Maize and Wheat Improvement Center, known by its Spanish initials as CIMMYT, in Texcoco, Mexico, on Wednesday, Feb. 13, 2013. The group, which performs research for agricultural productivity, will open its research facility this week. Photographer: Susana Gonzalez/Bloomberg via Getty Images