states, is there a blanket way of saying, we must do x, to ensure kids back in the classroom, across the country, for in-person learning in the fall? >> yes brian, so there's a lot we can say and do about, this but the first thing is we have to dispel some assumptions as some people of, may look at the map right, now where covid is most intense, it's in the under vaccinated states, with a lot of communities spread, if you looked at it as a static image, you might say, well the northeast would be living in a bubble, and we don't have to worry about. it but i would say definitively, there's a lot more that we don't know about the delta variant, how it spreads, how it's going to spread in the future, in one of the variants might be out there. we may feel secure in various parts of the country, but we should not get too complacent about it. we can have some principles that should be applied nationally, to make sure we are protecting children, starting with the fact that no adult