1,000 times. good morning. >> good morning to you, alex. >> do you know what happened? is there a clear answer out there, because i have been looking for one and i don't find one. >> we don't know where it started. we don't know the initial cause of the people in the markets to react. however, we do have a sense of process. the way it sort of played out, which is that a large part of trading on stock exchanges these days is done by computers, they're done by so-called al go rhythmic traders or prop traders, a bunch of different sort of players. what happened was, when the market started to go haywire, we're still not sure example exactly why. obviously, this was in the midst of concern about greece. >> okay, that was up on the trading floor, apparently. you saw the video of what's going on, the riots. >> police clashing with people in the streets. at the same time, worries about european banks, would they stop letourneau leblonding to each other, some of the same worries about the lehman brothers. so markets already looking at this. people begin to sell.