our science, the vaccines and antivirals on the horizon, we've done well in innovating and doing the science but the fact that 40% of americans have chosen not to take a vaccine that is miraculously effective and many people have not yet gotten the booster, people are choosing not to wear masks when they should, it's not just science but science plus sociology and some politics. got to get all of it right and if we get the virus a toehold, it will continue to take off. it is continually surprising us and it will continue tad that. it has a lot of curveballs in store for us. when we say we're done, the virus couldn't care less. >> is it mutating because people are not getting vaccinated so continues to spread and mutate? is that part of it? >> yeah, every time it replicates it gives itself an opportunity to have a little typo.