As a civil engineering technologist myself, it disgusts me to see these paid actors to go on TV and pose as engineers to issue propaganda. A fire at the top of a building would not cause the entire building to explode underneath it. That's what happened. It turned to dust. Steel and concrete does not turn to dust under structural failure, nor does structural failure in steel happen all in an instant. A tall skyscraper would tend to topple over, not collapse straight down, floor after floor. Especially with a localized fire. You would see the building slowly start to topple over, towards the fire. Columns are designed to buckle long before crushing. The fire would create moment forces, with the fire as the centre point. The parts above the fire would begin to topple over, which would in turn pull on the supports underneath the fire, creating too much shear in the connections which would then fail and cause the top section of the building to fall over sideways.[spoiler]“the process of transformation, even if it brings revolutionary change, is likely to be a long one absent some catastrophic and catalyzing event, like a new Pearl Harbor." -Rebuilding America's Defenses, PNAC, 2000 The members of PNAC are now known as the NeoCons who pollute Washington with their corruption. But it's just a coincidence that they all practice that one religion, right?[/spoiler]