100% agreed with JBroll on the north and south towers thing. As for building 7 though (which is neither of the north or south towers), I've seen some of the videos, and it absolutely does look like a controlled demolition. Check out this video:
http://youtube.com/watch?v=8T2_nedORjw
Does this amount to unshakable evidence that there was government conspiracy involved with taking down building 7? In my opninion, absolutely not.
The one narrator guy taken from the PBS segment, openly reveals that the decision was made to "pull" that building, because the fire department didn't feel that they would be able to contain the fires going in that building. Makes sense, right? If they don't have the manpower to go into building 7 and fight the fires there (because what manpower they DO have, they want searching for people in the existing wreckage of the north and south towers), then they obviously don't want to let the fires burn freely and spread throughout a 47-story building...so they decide to just demolish it, since it is already damaged and there isn't a better alternative.
Here's where I think the video gets the most retarded- the closing narrator asks how it could be conceivable that in all the chaos of the day, that a demolition crew could go in there and destroy the building...normally, controlled demolitions take several days or weeks to set up for. So this is evidence that the building was already all rigged up ahead of time for demolition, right!? Wrong. I really don't think it's far-fetched at all to think that a demolition crew went in there and set up something relatively quickly (a few hours perhaps) to bring that building down. I can think of two obvious factors that would support a faster setup time in the demolition of building 7:
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The shape of the building: Building 7 is basically box-shaped, and therefore structurally is probably very simple (compared to other buildings that are not strictly box-shaped). When the guy talks about how demolitions generally take much longer to prepare for, he is making a very broad statement that lacks a lot of necessary detail. In demolishing a big casino for example, which might be much more structurally and architecturally extravagant, I could see it taking a while to ensure on paper that the explosives are planted in all the right places and discharged at precisely the right sequence to bring the building down as planned...but with a box-shaped building, it seems to obvious to me that there would be much less thinking involved with planting explosives.
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Much less need to worry about causing residual damage to other nearby buildings: I'm not saying that a demolition team would just say "Well, the whole area is already a mess, so if we destroy other nearby buildings in the process of destroying building 7, who cares!"...but what I AM saying, is that if a bit of flying debris from building 7 were to cause a little bit of damage to an already damaged building nearby, is it really a big deal? No. Demolition crews are good enough to bring down a box-shaped building and have a high-degree of certainty that it will fall straight down as it should. In a "normal" setting, where a building needs to be taken down but nothing nearby can be damaged, I can see much more time being invested into the planning and execution of a demolition (such as pre-conditioning the building to reduce flying debris risks from it), but in the case of building 7, this does not matter.
Anyway, sorry for contributing to the hijacking of the Obama thread