But were any of those caused by a plane? What you have to understand is that jet fuel burns at a much higher temperature than the gas you put in your car. It won't even ignite at the minimal temp regular gas would, so that means you have an extra hot fire blazing. I recall hearing the temps inside were about 2,000 degrees, enough to soften the steel supports. After long enough exposure to high enough temps, the weight on top of those beams is going to overcome the strength of the softened beams and you have a collapse. When the first plane crashed, liquid, burning jet fuel fell into the elevator shaft of the building and was weakening the outer main supports with the same high temperatures. I understand how some of you think that if anything collapsed it should be the area above the plane crash, not everything below. But none of us are structural engineers and all we have is the differing statements by some who say this shouldn't have happened and some who say that when you take all these things into consideration, it's easy to see why they fell. In any case the fires were too far up to be accessible so at no point were the blazing fires in any amount of conrol by firefighters and for me it is perfectly understandable why the towers fell - extreme heat, time, and gravity....steel can still melt you know, how the hell do you think they make shit out of steel in the first place? Any metal is melleable, meaning it has bendable properties. The higher the temp the easier it will be to bend. You can't just say "well I took a lighter to a paper clip and it didn't melt, so how can steel melt?" I'll tell you how - because your bic lighter doesn't reach 2,000 degrees and burning jet fuel does