Billionaire Carlos Slim, from right, Enrique Martinez, Mexico's minister of Agriculture, billionaire Bill Gates, Eruviel Avila Villegas, governor of state of Mexico, and Melinda Gates participate in a ceremonial ribbon cutting at the 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, opens its research facility this week. Photographer: Susana Gonzalez/Bloomberg via Getty Images