polar vortex
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Watch: The polar vortex in the US caused even soap bubbles to freeze over
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US polar vortex: Over 20 people killed in cold snap, several cases of frostbite, fractures reported
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Watch: School officials across the US are announcing cancelled days via popular songs
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Watch: The Chicago River freezes as the polar vortex hits US Midwest
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US: Polar vortex hits cities in Midwest, emergency declared in three states
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