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Just to expand on this (entirely correct statement) for anyone curious about it, what specifically happened with the Twin Towers was this:
Each floor was made of a layer of concrete, resting on a steel frame. The frame was comprised of horizontal I-beams which were pinned to the outer walls at each end with L-brackets.
When the fire heated the beams, they softened ever so slightly. Just enough to make them sag a little under the weight. This, in turn, changed the angle at which the beams met the L-brackets, so now instead of all the force going straight down, some of the force was pulling the bracket away from the wall. The brackets, and the bolts that held them, weren't designed for this kind of stress, so they failed. As soon as I've bracket failed, that increased the proportion of the load being carried by the brackets around it, so they failed too (this is called a cascade failure). Once this happened on one floor, all that concrete fell down, smashing through the floor below it, and so on, in an even more extreme example of cascade failure.
So yeah, jet fuel can't melt steel beams, but it can expose design flaws.
I thought the "can't melt steel beams" thing stemmed from a supposed puddle of molten steel they found in the wreckage? If cascade failures are what they're on about, 9/11 truthers are even dumber than I thought :(