exposures, schools have been -- some schools have been evaluating a strategy of if exposed and exposed students test negative and have no symptoms, they can stay in school and in person. in marietta, georgia, 3% of students exposed were found to test positive, which means 97% of the students exposed were able to stay in class. what should we learn from this? >> well, we're now understanding the importance of keeping kids in class, doing in-person classes, but then again, if we were to take a step back, i would say the single most important thing to do is to ensure that everybody who walks into that school has a mask on -- teachers, staff, buggs drivers, the students, with the possible exception of some of the special needs kids who can't wear masks, and then vaccine mandates, making sure everyone who walks into the school who is eligible to get a vaccine gets vaccinated. those are the two most important