david reuben, director of the policy lab at children's hospital of philadelphia. and obviously, everyone, you heard me go through these recommendations. so, doctor, i -- i know that -- that you know, you're -- you all took a lot of time with this. published the new guidance, which is -- i will read it again -- supportive of keeping schools open even in times of significant community transmission. um you, with your medical expertise, go farther than the cdc. you would allow exposed but asymptomatic children and staff to continue no school. you put a lot of thought into this, right? you didn't do this lightrly. >> yeah, it's not just me. i think thrs a consensus statement from the headership at children's hospital of philadelphia. our centers, as well as clinical teams have been following the emergence of the omicron variant and covid-19 situation now for two years and we know there is a lot of anxiety out there as we have a swift-moving parentor slarnt moving across. and let's face it, everyone is exposed right now. it is very hard to distinguish who is exposed and