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Despite these high quality levels, the events that occurred in the Twin Towers led to an overload of the structure, which literally shattered due to the dynamic loads induced by the failure of the floors struck by the aircraft impact and then weakened by fire.
So although he has just shown how big and beefy the columns really were, he can still come out with a statement like this? Seriously? Also, what qualifications does he have to allow him to come to the conclusion that this was the exact reason for the tower collapse? And what about all the witnesses who on camera have said there were explosions, some even before the planes hit.
I came across this Italian blog about 9/11 by Enrico Manieri that claims that NIST report is correct.
(an engineering firm run by Leslie E. Robertson, the designer of the World Trade Center)