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Originally Posted by KirkVining
I don't see the need for any conspiracy theories. The floor the plane crashed in was sprayed with tons of jet fuel, causing a catastrophic fire. Iron loses it's strength as it gets heated, the floor collapses, the building pancakes.
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The computer models I have seen (I think it was the FEMA study) did not show the steel in the core reaching a temperature high enogh (450c) to lose its structural properties. I think the highest temperatures were 175c. But even if the core steel at the level of the fire failed, why did the whole core come down?
How did the core, which is essentially as long pillar of continuously joined steel, collapse? The floor steel yes. The core??
I don't know about the harmonics.