High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...

Prepare for a return of frigid weather in March—and April. Editor at Large You could be forgiven for not noticing that last month was the planet's third warmest February on record. That’s because ...

Step inside the strange world of a superfluid, a liquid that can flow endlessly without friction, defying the common-sense ...