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Originally posted by reductive.
7WTC, to me, is the least suspicious of them all. Its structure was severely compromised by the collapse of the other buildings and there were numerous fires on that building that were not appropriately dealt with as resources were focused on the other two buildings. I don't even think that it was occupied at the time because they evacuated much of the complex when the planes hit so it wasn't really a priority.
Also, the building was designed in a way that would not prevent the damage of the supporting column from compromising the whole structure due to the distribution of weight on the building.
Now how could such an important facility be constructed with such an Achilles' Heel? Well that's an interesting question indeed.
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I understand that a kerosene fueled fire would severely weaken the columns to the point of a collapse. But they couldn't melt steel, and there are hundreds of witnesses who all saw molten steel.
Again, the oxidized iron spheres found is a possible by product of thermate. The spheres were mixed with sulfur, but it couldn't have been from the dry wall because it was missing calcium. Or it had calcium, sorry, can't remember. On my phone.
There was also a huge iron sphere that was essentially a meteorite formed from the intense heat and pressure. It was literally 10+ stories fused together in a giant molten ball.