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Google's new startup Sidewalk Labs is trying to help cities ease growing pains as more and more people leave the suburbs and rural areas to move to major metro areas like Austin, Texas; Raleigh, N.C.; and Phoenix, Ariz. Former NYC deputy mayor Dan Doctoroff is leading the startup. Google already runs apps designed to simplify urban living, like Google Maps and Waze. The U.N. estimates 60% of the world's population will live in urban areas by 2030.