with dr. megan ranney, an emergency physician and associate dean of public health at brown university. dr. ranney, thanks so much. happy holidays. let's begin with the upcoming-thanksgiving holiday. you have suggested rapid testing immediately prior to gathering with family on this holiday. what else would you suggest that we do to stay safe this-holiday season? if it's cold out, do we need to throw those windows open? what do you think? >> so, it really depends on a couple of things. first is what percentage of your guests are fully vaccinated? the more of them that are fully vaccinated, the better. the second is how many people are coming? and are they coming from areas where there is a lot of covid right now? that makes it a little higher risk. and the third part is those rapid tests. they help to ensure you that no one is infectious the day of your get-together. depending on how those three variables fall, i do encourage opening windows, having air filters, or maybe even taking it outdoors if it is a lot of people and a lot of them are unvaccinated. the goal, of course, is to come