WTC7

Very few people I talk to realize that World Trade Center 7 also collapsed on 9/11/01. “The collapse of 7 World Trade Center is remarkable because it was the first known instance of a tall building collapsing primarily by uncontrolled fires.”

http://en.wikipedia.org/wiki/7_World_Trade_Center

http://www.nist.gov/public_affairs/factsheet/wtc_qa_082108.html

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