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Mexico José Antonio Robles Córdova (center), 11, plays on the “bicibomba,” or bicycle pump, at Escuela Primaria Josefa Ortíz de Domínguez, an elementary school in San Cristóbal de las Casas in Chiapas state, Mexico. He’s flanked by Ángel Gabriel Arias Cupil (left), 8, and Emilio Adrián López Gómez, 7. The bicibomba provides water for the students, teaches them how water circulates through a purifier, and gives them an incentive to exercise and play.