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Originally Posted by **********
DirtyF: You are wasting your time arguing with Greg on this point. He and I have spent many after-work evenings discussing these points.
I saw the same video that Greg and everyone else did. Those buildings FELL. No controlled demolition. The planes weakend it. The fuel burned and weakened the steel beams that remained. Hundeds of tons worth of the remaining floors SQUISHED the damaged floor, adding tons more which then SQUISHED The floor below that and so on. The combined weight plus the gaining momentum of all of that weight is what brought down the twin towers. No Dynamite required.
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Actually, in the allotted time, the fuel could not have weakened the steel columns and girders.
NIST has admitted that none of the temperatures in the buildings could have risen much above 650 degrees. Which is not even one-third enough to weaken steel, and which would require hours of exposure to cause softening (at much higher temps).
The Planes couldn't have damaged the structural integrity of the buildings because they were largely aluminum. The engines, made of titanium and other hard alloys, could have taken out some of the central columns. However, this is largeley and admittedly speculation on the part of NIST, and would not have engendered global collapse.