Who can be vaccinated, masking up, increasing ventilation, getting ready for cases and clusters because they will occur and having extra protection for those few students and staff who have serious underlying conditions and may be at particular risk. >> the president also previewed, dr. frieden, that he'd have more to say next week about back to school, but this is so important, i think, to moms and dads who have kids in this under 12 age group. there's one more, there's pool testing as well. can you talk about schools that successfully got through a year of in-person learning? we focus on the...