and guess what, experts concur, that is the pope's voice. he jokingly said, quote, what are the nuns doing that they can't answer? then he continued. quote, i am pope francis. i wish to greet you in this end of the year. i will see if i can call you later. may god bless you. that from the pope. the nuns decided they would just wait to call the pope. hopefully he'll call back. good luck on that. we'll have much more on whether he did, indeed, call them back. we're going to have much more ahead in the newsroom, and it all starts right now. here are the top stories we're following in the cnn newsroom. round two. here it comes again. a powerful arctic cold front is going to put nearly half the u.s. in a dangerous deep freeze