It’s really, really cold again — as the US shivers through at least the eighth blast of air from the Arctic this winter. Winter, which is warming faster than any other season for much of the US, seems ...
Live Science on MSN
US suffers record-breaking cold: What's going on with the polar vortex?
Polar vortices exist throughout the year at the poles. In the Northern Hemisphere, the polar vortex expands many times over ...
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