I dont understand, because planes are made of alluminuim, and the building is structeral steel, and as the plane entered it didnt even move a inch, nor did any part of it break or destory at it entered the building, it just went in like a hot knife through butter. How can that happen?
Also speed isnt a factor either, because still there would have been some resistance due to the fact of the materials a plane is made out of. Remember its not a bullet or a missile, yet it had the penitrating power of one.... how can that be?
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