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  • ‘Polar vortex’ moves east, blasting Arctic air, threatening frostbiteadd to reading list  

    Posted on January 6, 2014 at 6:30 PM

    The eastern half of the U.S. and Canada shivered Monday as a dangerously cold whirlpool of dense air known as a "polar vortex" threatened to break decades-old records and freeze exposed skin within minutes.

    By CBS News
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