from the last year of 2010, magnitude of 7.2 that did damage but didn't kill anybody. on february 22 of this year, there was a much smaller event, magnitude 6.3 that actually shook the area right under the city. and destroyed more than 1,000 buildings and killed a couple of hundred people. the buildings have been weakened from the earlier earthquake. that would be one of the big worries here. if there is an aftershock smaller than this, the structure in washington, d.c. and surrounding areas that weaken to the point where you could have considerable further damage. only engineers can tell you that. to some extent, even they won't be able to know the full extent of the daniel. a lot of is it hidden behind dry wall and masonry and all of those things. >> bret: in fact, some buildings are closed down including the one we are in now. we're operating at our own