'Polar vortex' pushes subzero temps into Midwest

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Two pedestrians go down a street in Chicago's South Loop with temperatures well below zero and wind chills expected to reach 40 to 50 below Monday, Jan. 6, 2014, in Chicago. A whirlpool of frigid, dense air known as a "polar vortex" descended Monday into much of the U.S. (AP Photo/Charles Rex Arbogast)