Recent study from the cdc that showed when a teacher was actually infected and not wearing a mask, that that teacher, in fact, infected half of the class. so we see across the country when masks are being worn, the incidents of spread of covid-19, masks do work. there are differences in masks quality of masks, the better the fit. the more effective it's going it be for your child. >> i want to put an exclamation point on that if i could. what we are seeing across the country in realtime in places where mitigation strategies are not taken as seriously, there is more school disruption and there ...