Colder than Antarctica: brutal deep freeze grips US Midwest

A life-threatening deep freeze gripped the American Midwest on Wednesday as weather colder than Antarctica grounded flights, disrupted travel and brought life to a standstill for tens of millions. Mail deliveries were suspended, schools and business closed, and residents encouraged to stay home in nearly a dozen states where temperatures overnight sank into the negative double digits, the worst cold to grip the region in a generation with all-time records still under threat. America's third city Chicago -- where the morning temperature was -22 degrees Fahrenheit (-30 Celsius), which felt like -50 degrees (-46 Celsius) with wind chill -- was colder than Alaska's state capital and even colder than parts of Antarctica.

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