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Just who were these guys?
[edit on 3-9-2009 by talisman]
Originally posted by prizim
how did they know it was going to fall? It was burning for hours and it had taken great damage from the towers falling. It was just a matter of time.
On November 20, 2008, NIST released its final report on the collapse of 7 World Trade Center. In the report, NIST explains that fire was the main reason for the collapse, along with lack of water to fight the fire. Fires continued to burn throughout the afternoon on the lower floors. At 5:20 pm. a critical column buckled, leading to the collapse of floor 13, which triggered a cascade of floor failures and global collapse. From collapse timing measurements taken from a video of the north face of the building, NIST observed that the building fell at free fall acceleration through a distance of approximately 8 stories (32 meters, or 105 feet). The entire building above the buckled-column region moved downward as a single unit, until completion of the global collapse sequence.