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This subject was determined to be settled a long time ago...
And if it were not for the fuel that burned after the strike, it would not have collapsed.
For it caused the metal supporting structure (frame) to bend and break. The shock of that heavy impact to the floors below was to much and they fell one after the other from the weight striking it in a way that it was not designed to handle like dominos.
And yes it does look like the same method one would use to demo a building of this size.
Because that was the intent of those folks who sent the planes in where they did with as much fuel as possible at the time of impact. It was not by chance but design.
They intended to do just what happened or they would have crashed them at a lower level. It was known after the attempted bombs in the foundation in the 90's that they had the design blueprints of the building and there was a pretty big scandal about that back then. They were well advised by a engineer.
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