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Why the Towers Fell
A companion website to a PBS "NOVA" program that "follows a team of forensic engineers during their in-depth investigation of the precise causes of the Twin Towers' collapse." An engineer discusses the 2001 World Trade Center collapse and methods of improving building safety. Includes articles about a survivor from a floor above the impact, firefighter equipment, and the structure of metal. Includes a list of related books and online resources.
http://www.pbs.org/wgbh/nova/wtc/

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