how do explosives make a certain section of a building collapse at the EXACT INSTANT they are set off?
"secondary explosion" there would not be one secondary explosion there would be as many explosions as there are floors on each building or at least close to it. unless you're trying to say they all went off at once but somehow showed no evidence of it on video tape.
logic and common sense go hand-in-hand, just like conspiracy theories and tin foil hats.
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