Theres nothing odd or a conspiracy. The twin towers were designed by an asian architec who used some techniques and designs used in asia to build building/skyscrapers on the twin towers. They used steel frames and some type of flexing poles. So in the event of a tragedy like it would collapse on itself. Im from NY, so i can only imagine how much more terrible if both the towers were actually topple over onto Downtown Manhattan. When the planes hit the towers there fuelsalage exploded aiding in the collapse.