ask questions around physical distancing where appropriate. and also ask questions around filtration of air. we must never forget that to beat this pandemic, we need a multilayered approach. we can't just focus on one or the other. and that is what i want parents to know. >> good advice. doctor, thank you. and let's turn now for more on that winter storm we've been talking about affecting tens of millions of americans. d.c. and mid-atlantic getting their first major snowfall of the year. and some areas expected to get up to a foot of snow. let's show you the new video in of the heavy driving snow as president biden was getting off air force one just moments ago. take a look at that treacherous walk down the stairs. chad myers is tracking all the wild weather. that is a painful snow. >> and i've seen some pictures of snow flakes about the size of