For most Americans, the image of the collapse of the World Trade Center Towers was not only a scene of unforgettable horror, it was a moment of unimaginable consequence. Who could have guessed that a steel behemoth of such size and strength—a building so massive that it had its own zip code—could actually be reduced to 150 feet of dust and rubble? NOVA offers viewers an exclusive look at the American Society of Civil Engineers' (ASCE) report into the root causes of the Towers’ collapse. NOVA presents “Why the Towers Fell,” Tuesday, April 30, 2002, at 8 PM ET on PBS (check local listings). Log-on and tune-in.

Visit the Web site today at http://www.pbs.org/nova/wtc/ to:

Towers of Innovation
A basement like a bathtub. A building like a tube. An elevator system like a subway system. Read about these engineering marvels that made the quarter-mile-tall World Trade Center possible. 

The Collapse: An Engineer's Perspective
In this interview, Dr. Thomas Eagar, a professor of materials engineering and engineering systems at MIT, explains how and why the Twin Towers survived the initial impact -- and how and why they likely failed in the end. 

Above the Impact: A Survivor's Story
Brian Clark was one of only four individuals to escape the South Tower from above the floors where United Flight 175 struck, and he was one of the last people out of the tower before it imploded. Read his riveting, vividly personal tale. 

Outfitting Firefighters
The firefighters that raced up the stairwells of the doomed towers carried several dozen pounds of equipment, everything from axes and turnout gear to thermal imaging cameras and self-contained breathing apparatuses. In this interactive simulation, equip firefighters for a high-rise response. 

The Structure of Metal (Hot Science)
In this flash animation, explore metal at the atomic level and discover how it's structured, why it bends, and what happens when it heats up. 

Join the NOVA Online Mailing List
Teachers, viewers, and surfers can join the NOVA Online mailing list for a free e-mail notice when the site is updated with new interactive features, interviews, and lesson plans. 
 
 
 

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