I was up until 3am watching 9-11 video last time you posted a link. Having worked in a structural test lab, and understanding the mechanics of how and why structures fail, I had been in agreement with the opinion of Dr. Ashkenazi (sp) of MIT when he determined a combination of Euler buckling columns and material degradation due to heat was the cause.
One of the videos that I have never seen before, I found very disturbing. It shows a series of windows, several floors down from the damaged floors, being blow out from the inside. In the image, the windows blow out in order from left to right at regular time spacings. If this were a random set of explosions, then it would have timing like a pack of firecrackers - lots of pops together and maybe a few stragglers detonating later - it certainly would not progress in order from left to right at regular intervals. In addition, one of the other sides of the building can be seen exhibiting similarly timed blow outs. The tower collapses a few minutes later.
I can now no longer agree with the conclusion reached by Dr. Ashkenazi and promulgated as the official cause.