Either we've been wasting billions of dollars on controlled demo, or that was controlled demo.
Why bother with it if all it takes is a fire fueled by paper and diesel?
3 near perfect falls, on the same day. Physics definitely plays a part with the weights we are talking though, and we often forget that that whole city is "hollow". Still, there's some awfully compelling photo evidence of some very large beams being cut with intense heat. Cutting steel that size in that manner with oxy/acetylene is hard enough. Lotta lack of "transparency", lotta people who work in the fields of demolition and structural engineering that are crying foul.