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 ...

'Siberia is burning': Russians choke on forest fire smog

Svetlana Tuflyakova is in a hurry as she pushes her small son in his pram, keen to get back inside her house and away from the permeating smoke of Siberian wildfires: "It feels like it fills your whole body," she says.

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