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I saw a documentary that explained the fall of the towers. The fire from the jet fuel ignited everything and caused a severe sagging of the girders, which ultimately failed. The girders were not designed to have the kind of loads place on them which resulted from the sagging. The sagging caused them to pull out of the exterior wall.
The documentary showed tape of the collapse, examining the split second when collapse initiated, and it happened exactly as the structural experts said it would under such conditions.
Conspiracy theorists will be disappointed, but there is near 100% certainty that the fire caused the collapse.
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