Cool Tools For the Third World

From Internet antennas bolted to trees to pedal-powered laptops, they are bringing 21st century advances to those who need them most

BOB MARSH, MARK SUMMER and KRISTIN PETERSON

Life in four African villages was transformed after these San Franciscans installed a wi-fi system. "The farmers learned on the Internet how to prevent diseases, control pests and increase plantain production," says Summer

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