Bitter cold wind chills proving deadly, hindering airlines, power grids, schools - CBS News
How long does it take to get frostbite?
Deadly cold overspreads US with freezing temperatures felt from border to border
Arctic blast bears down as more than 200 million Americans under threat from massive storm
Winter storms leave 89 dead across US as chill settles over Great Lakes and Northeast
At least 2 dead as bomb cyclone brings subzero conditions and warnings to millions
Arctic blast leaves over 110 million under wind chill warnings
Arctic freeze continues to blast huge swaths of the US with sub-zero temperatures
US winter storms: Dangerous Arctic freeze will linger through midweek