that fires didn't bring down the buildings. Any fire, hot enough to soften the steel would have been absolutely visible.
But ... some other interesting aspects ...
-the plane ostensibly hit the second tower and we saw the huge fireball blowing out of the side of the tower. However, if you simply follow the plane's movement "through the tower" ... it never slows down a bit!
-the plane simply melted into the side of the tower with absolutely no sign of a collision. No stuff sticking to the outside or dropping off.
-the tower never moved. This has always struck me as very strange because with that amount of leverage, the tower should have VISIBLY swayed, stopping a huge airliner going 500 mph up that high.
-the towers were BUILT ... like a shiek brithouse. They were rooted into the ground but the TOPS of them were completely "grounded" as well. The top 3 floors were nothing but empty space and MASSIVE "hat trusses" inside of those spaces ... tied the external walls with the internal support columns in the center.
The hat trusses would equalize the effect of expansion...
In summer, the external wall columns would expand more than the internal columns. Without a hat truss, the FLOORS near the outside walls would have been about a foot higher than the walls at the core edge at the highest floors! In winter, the external columns would have been about a foot or more SHORTER than the internal columns ... and the floors would slant the other way. This was totally unacceptable.
The hat trusses kept everything uniform despite expansion. In summer, the trusses would put the full load on the external walls, and "stretch" or pull up the center columns. In winter, they'd do the opposite.
You can see from that, when you think about it ... that the EXTERNAL WALLS would have needed to break completely before those towers could begin to collapse.
What caused the external walls to "break" then ... if they had full capability to hold up the entire building and even stretch the central columns upward? There was no visible hot fire on the external walls.
- WHERE WERE ... the hat trusses ... in the debris of the towers? There's no way they could have collapsed and disintegrated into powder from smoke from a fire below. They were so massive and strong, they'd have hardly been "dented" even when falling 1000 feet. Yet ... they magically just ... "disappeared"!