Deep freeze grips U.S.

Associated Press
University of Wisconsin-Madison student Marisa Weich contends with sub-zero wind chill temperatures while making her way to class on the campus Tuesday, Jan. 22, 2013. (AP Photo/Wisconsin State Journal, John Hart)

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A cold snap has sent as waves of Arctic air swept south from Canada, pushing temperatures to dangerous lows and leaving parts of the Midwest and Northeast reeling.

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