Why does this have to be explained?
Two very large jet planes full of jet fuel crashed into the two towers. WTC was by flaming debris and the building caught fire. Within hours both of the two towers fell, dropping millions of tons of concrete, steel, and debris at the foot of WTC7. So at this point we have a large building with an out of control fire, no water water pressure to put the fire out, and two very tall towers that feel at the foot of the building....
And you have to ask why the building fell? Really?
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