A huge filament of solar plasma has broken off the sun's surface and is circling its north pole like a vortex of powerful winds, but scientists have no clue what caused it. "Talk about polar vortex!
Chicago and much of the Midwest are still caught in the throes of ice, snow, bitter wind, and cold. It’s not the -40°F we saw last week during the polar vortex, but even now Chicago continues to ...
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