joining us now on this very big day is cdc director doctor rachelle wilenski. doctor wilenski, it's a real pleasure to have you tonight. thank you for making the time to be here. >> my pleasure. good evening, rachel. >> so, i have a lot of feelings. [laughs] if i could just speak in personal terms. you said in the briefing we all long for this moment. my heart leapt into my. throat it's true. it's such good news after all this. time at the same, time i'm very nervous about what you said today. it is hard for me to imagine myself, you know, waltzing into the stop and show tomorrow not wearing a mask. i just feel like i am not wired that way anymore, and it still feels risky. again, forgive me for speaking in personal terms. i don't need to be too blunt about this. but, how sure are you -- because, this feels like a really big change? >> we're sure. there's an extraordinary amount of evidence now that demonstrates that the vaccines are working in the real world. in covert study, in care facilities, in all states. these vaccines are working the way they did in the