Traffic stands still in Nairobi. People in Kenya's capital don't like getting into cabs driven by strangers. They prefer to call drivers they know or who their friends recommend. Goran Tomasevic/Reuters/Landov hide caption

toggle caption Goran Tomasevic/Reuters/Landov
A Taxi App Aims To Build Trust Where Crime Is High
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The Mathare Valley, shown here in an aerial map, is one of the largest and oldest slums in Nairobi, Kenya. Residents are using hand-held GPS devices to map the area, which comprises 13 villages and is home to nearly 200,000 people. Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley hide caption

toggle caption Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley
In Kenya, Using Tech To Put An 'Invisible' Slum On The Map
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