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What's Really Causing the Deep Freeze in the U.S.?

The Wall Street Journal
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January 07, 2014 AT 9:13 PM
Some scientists say the distorted "polar vortex" is to be blamed for the big chill that moved across the Midwest, Southeast and Northeast this week. Other say the real reason for the bitter cold temperatures may be more complicated. WSJ's Monika Vosough reports. (Photo: Getty Images)