i was sickened, like a body blow. ♪ and so somehow, i just got my act together, and i just started talking. the tragic loss of the space shuttle columbia on her 28th flight, the 113th shuttle mission, 16 days seemingly flawless ending with a sudden and seemingly inexplicable disintegration over northeast texas. ♪ things happened very quickly. there was a conversation, a transmission from rick husband, the shuttle commander, sort of half of a "roger," if you will, that kind of thing, and it was all over. let's try to put together what we know and give you a sense of where this investigation might be headed.