Chances are iffy here in Dallas that you've not watched even a snippet of the Winter Olympics on NBC or its corporate siblings on cable's NBCSN, CNBC and USA Network.So reports Nielsen, the official arbiter of all things ratings and viewership from coast to coast.Nielsen reports that 59 million of the nation's 112 million homes have tuned in to the events going on in the winter wonderland known as Pyeongchang.