Swings in the economy. and vaccine maker moderna up 20%. that is because investors are betting there is a lot more demand for vaccines going forward. travel stocks really got hit very hard today. we saw airlines like delta, united, they fell, carnival and other cruise operators and marriott and airbnb all fell pretty sharply. we do need to put this into context. despite today's losses, the market is still up 22% on the year and more than doubled from the march 2020 lows and there is just so much we don't know right now. we don't know how quickly this will spread, or how effective vaccines will...