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Deep Freeze

<p>Temperatures plummeted as a whirlpool of frigid, dense air known as a "polar vortex" descended on much of the United States.</p>
A woman braves the cold during her morning commute on 5th Avenue January 7 in New York. A blast of bone-chilling cold snarled air travel, closed schools and prompted calls for people to stay inside in the United States and Canada, as temperatures plunged to lows not seen in two decades. Superlatives of cold-talk abounded, even in midwestern states used to chest-high snow and bitter cold, as the National Weather Service said the deep freeze was making its way east. TIMOTHY CLARY / AFP - Getty Images