again, if you're fully vaccinated and you're outside, whether it's a farmer's market, that parking lot, if you're going to be out there for a long period of time around people, maybe a little bit safer to wear the mask, but otherwise, i think it's fine to go without. >> and dr. jha, so much today focused on what vaccinated american adults can now do. i was curious in listening to the guidance from the cdc and the president, what about children? obviously not vaccinated. do they wear masks outdoors or can they take them off, too? >> yeah, this is a good question, david, and kids, especially the younger ones, may not be vaccinated for a while. i think as infection numbers come down, if you don't have a large gathering, i think it's pretty probably reasonable to get the kids -- their masks off, as well. but we do have to be a bit more careful for a little longer, because there's so many infections out there. as those numbers come down, i think we'll be much safer. >> dr. jha with us again tonight. thank you. and one more point on the virus tonight and easing masks outdoors. we saw president biden on the north lawn today, taking off his mask, walking back to the white house without it, saying he would put it back on in the white house when he got back to