I've read all about the WTC towers being brought down by explosives, rather than the planes. I've re-watched the videos and these towers fell from the top down. The towers buckle out at the point of aircraft impact and start falling downwards taking the lower floors out progressively. On the other hand, any demolition job with explosives involves destroying the base of a building with successive blasts travelling up the building so as to drop the whole thing in one neat-ish pile.
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