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Quite.
Oh yeah...because I can't sleep and left out one part of the post I was answering.
Traces of thermite and how it got there.....
Aluminium and iron oxide equals....anybody? Anybody at all? Say it loud now, most of us played with making it as kids...THERMITE.
Yep, your magical miracle trace element.
...And not just for burning through your parents garage roller door either.
You can refine it, you can do funky things that make it burn hotter or more directionally depending on what medium you adhere it to...but at the end of the day thermite is iron rust and aluminium.
oxidising iron like the window frames of the bulding for instance.....andaluminium like...of, I don't know....say a goodly percentage of 40+ tons of commercial aircraft....
As further reading, you may want to check out the original building specs and plans. I am sure they had to include the proposed controlled demolition specs (you do not get permission to build sky-scrapers in built up areas without explaining how you would make them go away after their usefull lifespan). I think you will find that the vertical pancaking is a sort of design feature of those towers....especially as the alternative is, as pointed out by the previous poster, taking out huge swaiths of city.
Goodnight.
Sasha
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