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Pile-Driver Theory
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The South Tower's Top Disintegrated As it Fell
The curvature of the wall shows about 30 stories above crash zone had shattered less than 2 seconds into the collapse
Top did not rotate about fulcrum, rather it rotated freely about a changing axis.
Angular momentum of the tipping top vanished. Only the disappearance of the moment of inertia through the breakup of the top can explain this.
NBC video
Frames of NBC video at one-second intervals:
page 78
Copyright 2006
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