chris. you know, if i may real quick -- >> sure -- >> i get this question all the time. in 20 seconds, a lot of people who got two doses of pfizer are asking, hey, doc, can i get -- should i get the half dose moderna boost, the half a dose or -- pfizer as the third dose. it doesn't matter. what we know is that you can do either/or. mixing and matching. i got a third shot, and that third shot was moderna. i did not get the third shot of pfizer because i really believe the mix-and-match data to be very reassuring that it's safe and effective to switch brands. it doesn't matter, though. the full dose pfizer, the third shot, or the half dozen moderna, either/or totally fine. hasn't really been studied which one is better if you got two shots of pfizer up front. i know it's pertinent to people, these are the questions they're asking. >> dr. gupta with an important answer to my unimportant question. always good to see you. happy thanksgiving to you and yours, appreciate it. >> thank you. on the road again, millions of people taking those planes,