The record-breaking polar vortex gripping the Midwest United States has caused at least 10 deaths, including road accidents. A number of schools continue to be shut down, while the U.S. Postal Service has had to postpone mail delivery in 11 states. Amtrak suspended service in and out of Chicago, where windchills dipped to -50 degrees Fahrenheit Wednesday. Thousands of flights have been grounded across the region.
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