Defining geographic regions with commuter data

A new mathematical approach uses data on people's commutes between and within U.S. counties to identify important geographic regions. Mark He of the University of North Carolina at Chapel Hill and colleagues present this ...

Study details the quirky geography of knowledge-sharing

Scholars have long been interested in tracking "knowledge spillovers," the way technical and intellectual advances spread among communities of researchers and innovators. And a significant body of work has shown that distance ...

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