doing it right lose to people who are doing it wrong, and that you will see within the vaccination rates but also geographical differences of observance that they could create a cascade effect that in some places is good, other places is very bad, and everywhere is going to go wrong because bad beats good in this situation. is that another big bad maybe? >> it's certainly possible. another is going to be the variants. and what's happening in other parts of the world if there are variants that are more transmissible. and evade the protection of the vaccine. i think the other part is we just don't know about this virus. i mean, i think the best thing that we have in our favor is to get as many people vaccinated as possible, but one of the concerns that i have that you and i talked about before is maybe the summer is going to be great, which is something to celebrate for sure, but i also think that further removed the urgency for people to get vax vaccinated.