Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. 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/ Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *