Pedestrians brave the cold during their morning commute on Friday in New York. Arctic air and bitterly cold wind is moving across the Northeast, plunging temperatures into record-low single digits, accompanied by subzero wind chills. John Minchillo/AP hide caption

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At the Australian Bat Clinic in Queensland, 15 baby flying foxes (bats) were lined up and ready to be fed Thursday. They were brought there to get out of the extreme heat, which has killed hundreds of thousands of bats. Trish Wimberley/AP hide caption

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Hell, Mich., is embracing its frozen fame. The town's Facebook page now features this photo from 2003. Keasha LeClear-Morse/ hide caption

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A man walks through a steam cloud in frigid cold temperatures Tuesday in Manhattan. Brendan McDermid /Reuters/Landov hide caption

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Robert Vick, in an undated photo provided by Kentucky Department of Corrections. After a cold night and day, he asked to be put back in prison. AP hide caption

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Ice has built up along Lake Michigan in Chicago as temperatures have plunged in recent days. A dip in the polar vortex is to blame. Scott Olson/Getty Images hide caption

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Julie Caruso of Akron, Ohio, was wrapped up Tuesday as she waited in line for a White House tour. It was well below freezing in the nation's capital. Temperatures were even lower in other parts of the nation. Kevin Lamarque /Reuters /Landov hide caption

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