You were citing this as your proof of how the buildings fell. As you can see, they are saying the angle clips (the things I was describing as functioning like brackets) are the week point. In the illustration, we can see the the angle clips were positioned at the ends of the joists, where the joists were affixed to the outer perimeter, and also the core structure. If the angle clips were the week point, they would have given way at the point where they joined the joists to the core structure, and the core structure would have remained standing...
"Nearly every large building has a redundant design that allows for loss of one primary structural member, such as a column. However, when multiple members fail, the shifting loads eventually overstress the adjacent members and the collapse occurs like a row of dominoes falling down.
The perimeter tube design of the WTC was highly redundant. It survived the loss of several exterior columns due to aircraft impact, but the ensuing fire led to other steel failures. Many structural engineers believe that the weak points—the limiting factors on design allowables—were the angle clips that held the floor joists between the columns on the perimeter wall and the core structure (see Figure 5). With a 700 Pa floor design allowable, each floor should have been able to support approximately 1,300 t beyond its own weight. The total weight of each tower was about 500,000 t.
As the joists on one or two of the most heavily burned floors gave way and the outer box columns began to bow outward, the floors above them also fell. The floor below (with its 1,300 t design capacity) could not support the roughly 45,000 t of ten floors (or more) above crashing down on these angle clips."
These are YOUR experts, Bill, that you were waving around as proof that all questions have been answered. Anyone with any grasp of physics, and with the explanation being given by these "experts", can see that what these people are suggesting happened is not possible.