Nova: Why the Towers Fell PBS presents yet another outstanding companion web site to one of its in-depth investigative programs -- an examination of the precise causes of the Twin Towers' collapse. Learn about the WTC towers and the engineering advances that made them possible, then get an engineer's perspective on why the towers survived the intitial impact but later collapsed, and finally read a personal account of one of only four individuals to escape from a floor above the point of impact. The site also examines firefighters and their gear, as well as the structure of metal and how it responds to heat. Although the motives behind the attacks and destruction of the buildings will never be fully understood, this site lucidly presents the facts of the skyscrapers' structural failure. (in September 11th Attacks)
