Buildings, people, cars, furnaces, animals, are under unusual stress today from the arctic blast. The extreme cold is breaking records for this day in Chicago history. But its not the absolute coldest. Click here to see which were the coldest days in Chicago history. Today's record lows don't even rank in the top 15 coldest days.
Most readers should be able to guess where these photos were taken. The iPhone let me know that it was time to get inside when it shut down in spite of 20 percent power in reserve.
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