well-fitted mask is crucial to preventing the spread of coronavirus. and so i think it's unfortunate that masks have been so politicized and entering year three of the pandemic, people still have doubts about the efficacy of masks. we have a lot of data that shows that even in schools where there are mask policies mandating that students wear masks or are less likely to have outbreaks, children are less likely to be hospitalized. we know that even in communities where mask policies are in effect that they lead to a reduction in cases and in deaths within weeks. so i think it's important for the public to understand that masks may not be perfect, but they are part of this multilayer strategy that's important for containing the virus. >> you heard that woman threatening to bring guns to her school if kids have to wear a mask. are you surprised at the level of anger right now, that emotions are still so raw? >> well, yeah. i think it's part of the culture