chevron, a number of universities and new york city public schools who have said they're going to mandate vaccinations. i think we'll see a tidal wave of these over the coming days. it will play out differently by type of employer, type of employee, corporations may come on board. they may mandate their corporate employees first, their front line employees later. small and medium size businesses will be more geographically dependent. some may fear backlash from local communities if they impose mandates. >> what a complicated world out there. phil rucker, i'm curious as to what you're hearing from the white house tonight. they're cheerleading the pfizer development, as they must. but are they at the same time as realistic as dr. gounder?