at this point in time, nothing can be ruled out. and what the competent investigators do is create hypotheses. and at the beginning, you have to imagine anything, and everything, that could have happened. and keep turning over, you know, the evidence. and studying and proving, or disproving, different theories until you are down to one. exactly, what happened. it's painstaking work. it takes a long time. >> what do you see, when you look at it? >> the fact that this building stood for 40 years and fell today is going to be the focus of a lot of the investigation. why? >> if you are looking at this video, because that's part of the investigation, is this video. are you seeing anything, in that, glenn? >> i don't -- i don't see the video right now, on my screen. >> but i mean, have you -- have you seen it on the air, or no? >> i have watched lots of videos today. are you referring to the one that shows the collapse? >> the one that shows the explosion. it's from fox sports 640 south florida and it looks like it's some sort of tower cam,