>Key supports inside the building were taken out by the fires, and you can see the penthouse falling inward before the shell collapsed. That isn't how controlled demo works.
Everything about the collapse of the WTC screams infrasound, but very few people get this and the fact that infrasound can be a very directed weapon. I've pasted links before but getting a bit fed up with having to counter such fairy-tales as surreptitiously planted explosives. A directed infrasound weapon ticks all the boxes. And it can literally turn matter (of any description) to dust instantaneously.