confidence because things change too much on the government level and then the hard stop is we just don't know with this thing. it hasn't been tested. it's brand new. they don't know how it is on kids. they barely know how it is on adults. they're learning in realtime. i don't want them to go to school on my kid. >> well, chris, the issue is if you look at the data itself, you look at the data, there have been literally billions of doses that have been given worldwide. there have been about 400 million doses given in the united states. it's very very clear that the experience with these vaccines is rather intensive, so the idea of saying we don't know a lot