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 ...

Cities are key to saving monarch butterflies

It's easy to think of cities as being the enemy of nature. When we talk about escaping the skyscrapers and car horns, we have visions of breathing in fresh mountain air while hiking through forests in mind. But for Monarch ...

Big cities feed on their hinterlands to sustain growth

Researchers at Linköping University in Sweden call into question an influential theory of the self-reinforcing dynamics of urban growth. Their research, published in Science Advances, shows that big cities feed on their ...

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