As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...
The Chosun Ilbo on MSN
Polar vortex deviation behind Northern Hemisphere cold wave
This winter, the Northern Hemisphere has been suffering from extreme cold. South Korea has experienced an unusually prolonged cold wave even after the traditional coldest day of the year, Daehan ...
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