(Associated Press) There's cold. And then there's subzero, frostbite cold.
Record-breaking frigid temperatures will blanket the Midwest beginning Sunday, part of a "polar vortex," that one meteorologist says will send piles of North Pole air down into the U.S.
These below-zero temperatures can be dangerous, and officials in several states are warning residents to take precautions. Here's a look at some of the problems that arise when temperatures plummet and how to stay safe if you venture outdoors.
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