from chicago, here's don dahler of cbs news. the people in the midwest are a hardy bunch. they are used to cold weather — but nothing like this. —45 celsius windchills here in chicago. the city is taking precautions. they have been trying to prepare people for this weather. they have opened up some city buses to be homeless shelters for those who have no place to go. they are using, in effect, flame—throwers to melt the ice on tracks and they are using chemicals to melt the ice on aeroplanes. homeowners are desperate to keep their pipes from bursting in the cold, so they are putting up space heaters. but the officials say their best piece of advice is, if folks don't have to go out, stay home, stay warm. don daler, cbs news, for the bbc news, chicago. very dramatic weather. carol has