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

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In Kenya, Using Tech To Put An 'Invisible' Slum On The Map

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Cable cars move commuters over a complex of shantytowns in Rio de Janeiro, one of many cities taking part in the smart city boom around the world. Felipe Dana/AP hide caption

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Tech-Savvy Cities May Be 'Smart,' But Are They Wise?

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Little By Little, 911 Centers Receive Emergency Texts

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Miami Public Service Aide Tatayana Harris enters information into her laptop after clearing an accident in Miami's Little Havana community. Harris has been a Miami Police PSA for five years and hopes to become a police officer. Marsha Halper for NPR hide caption

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Police Take Different Approaches To 'The Tyranny Of 911'

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Pullman Rail Journeys is bringing restored, historic luxury Pullman train cars back in service between Chicago and New Orleans. Courtesy of Louisa Chu/WBEZ hide caption

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City Life Snapshot: Pullman Rail Car

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Micaela Torres and 2-year-old Jakai Johnson swing underneath a surveillance camera at Miwok Park in Elk Grove, Calif. The city's police department collects more than 100 video feeds from across the city. Steve Henn/NPR hide caption

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In More Cities, A Camera On Every Corner, Park And Sidewalk

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Residents of the Estonian capital of Tallinn can use public transportation for free after purchasing a special card for 2 euros. Raigo Pajula/AFP/Getty Images hide caption

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Tallinn: The Former Soviet City That Gave Birth To Skype

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The Spanish city of Santander is using a network of sensors to help improve services and save money. Incidents reported to Santander's command-and-control center, where the city manages data from sensors and smartphone reports made by citizens, are plotted on a map of the city. Courtesy of the University of Cantabria hide caption

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High-Tech Sensors Help Old Port City Leap Into Smart Future

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Rio's Operations Center brings together more than 30 agencies and allows them to coordinate on daily issues such as traffic, as well as on emergencies such as the frequent flash floods in hillside slums. Raphael Lima/Courtesy of the Operations Center, City of Rio De Janeiro hide caption

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Rio Goes High-Tech, With An Eye Toward Olympics, World Cup

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Information, like light, flows through cities in interesting, often beautiful, patterns. Valery Hache/AFP/Getty Images hide caption

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What Big Data Means For Big Cities

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Sound Of Your City: Construction, Food Truck, Parks

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