ArchitectureWeek: World Trade Center Destroyed: Editorial by Kevin Matthews, editor in chief and B.J. Novitski, managing editor.Collapse of the World Trade Center: Discussion of the engineering of the towers, and speculations about the modes of failure. From the University of Sydney Department of Civil Engineering.How Could the World Trade Center Collapse So Quickly?: A brief technical review of the World Trade Center's construction and its tragic destruction. From The Society for New York City History.King Concrete: An interview in New Scientist with John Knapton, professor of structural engineering at Newcastle University, employed to assess the collapse of the World Trade Center.New Scientist: Design Choice for Towers Saved Lives: A lucky choice of design for the World Trade Center towers reduced the death toll caused by their destruction, say engineers.Nova Online: Why the Towers Fell: Investigates the causes of the collapse. Includes interviews with a survivor and an engineer, information on the design of the building and the structure of metal.scieneering.com: Presents observations, analyses, and conclusions that are believed to be worth presenting for discussion. Comments, questions, and corrections are invited.The Science of Terrorism: Jupiter Scientific explains the physics of the destruction of the towers.WTC Locked Fire Doors and Other Exit Barriers: Accumulation of quotes on locked doors into and out of the WTC fire stair, plus other evacuation barriers, including barrier to the disabled.