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Skyline framed by icicles

Reuters photo The Chicago skyline is framed by icicles in Chicago, Ill., on Wednesday. A deadly blast of arctic air shattered decades-old temperature records as it enveloped the eastern United States on Tuesday.1 / 2
Reuters photo The U.S. side of the Niagara Falls is pictured Wednesday in Ontario, Canada. The frigid air and “polar vortex” that affected about 240 million people in the United States and southern Canada will depart during the second half of this week, and a far-reaching January thaw will begin, according to AccuWeather.com.2 / 2

Reuters photo

The Chicago skyline is framed by icicles in Chicago, Ill., on Wednesday. A deadly blast of arctic air shattered decades-old temperature records as it enveloped the eastern United States on Tuesday.

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