help where the supply even is available to continue with that. and i think it is also interesting to compare to the most highly vaccinated country in the world, that being israel, and how they again reintroduced face masks because -- even with high vaccination coverage due to the delta. delta has changed the equation. so even the most highly vaccinated country in the world isn't throwing all caution to the wind. they are making their risk assessment here and saying that we want to protect those gains made. and the u.s. has made a lot of gains, but they can quickly be lost too if that progress doesn't continue and if really complicated challenges that are multi-factorial, it is -- you need to have expertise from all disciplines coming into these policies particularly when we look at why people with r. shunning the vaccines in the