Colder than the South Pole: U.S. Midwest gripped by deep freeze

A blast of polar air brought record-low temperatures to much of the U.S. Midwest on Wednesday, canceling trash pick-ups, halting the mail and forcing residents who pride themselves on their winter hardiness to huddle indoors. Classes were canceled for Wednesday and Thursday in many cities, including Chicago, home of the nation's third-largest school system, and police warned of the risk of accidents on icy highways. In a rare move, the U.S. Postal Service appeared to temporarily set aside its credo that "neither snow nor rain ... nor gloom of night" would stop its work: it halted deliveries from parts of the Dakotas through Ohio.

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