Look at all the people popmech and the NIST got there interviews from, that is the research I am pointing too, all that research and experts. Second, they did not get the parameters from anyone, except the facts know about the situation, the structural material of the buildings and planes, and the temperatures researched in the physical, real world simulations.
The initial impacts in all the simulations mirror the real world events, showing that a plane hitting the pentagon will go inside and be shredded by the support beams. And that the planes would break many outside supports and inner supports of the WTC. The simulations and common sence show us that heat applied to a metal truss, stripped of its fire proofing will expand, warp and loose al manner of structural integrity; eventually leading to the collapse. This is backed up by video evidence of the walls being pulled in as the fires died down and the metal trusses cooled. this cooling pulled the outer supports in, as seen in the final video's, since the weight was not directly over the support, they buckled and pancake all the way down, the forces being so massive that the below floors causes no real resistance, giving a near freefall speed.
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