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Originally Posted by ObieX
Take that same brick and then drop 20 stories worth of those bricks and steel beams on top of it and see what happens. Then try it with 40.. 60.. 80.. 100 stories of steel and concrete.. I think, yea.. it will be flattened into dust.
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That's just it: it's not 20 stories. It's ONE story. Those are the top floors of the North Tower, at the first moment of collapse. All fire and impact damage are many floors down. This was the building where fire was visible for a maximum of 16 minutes, and where the fire was repeatedly reported as dying down. People could be seen at the impact hole, alive. This would suggest very little heat, spread across thousands of tons of steel. Somehow, the roof collapses first.
This is, at the very least, counterintuitive.