Video starts at 01:30 I just found out about this documentary last night as while browsing YouTube. I have always wondered why the World Trade Center Towers collapsed in such a fluid fashion. The video says one of the towers collapsed in 8 seconds and the other tower in 10 seconds. I knew they came down fast, but I had no idea they came down that fast. One of the points the video makes is that a bowling ball thrown off the roof of one of the World Trade Center Towers would take 9.27 seconds to reach the street. A heavy steel structured building collapsing in on itself from just the heat of a fire would take considerably longer than that. After watching the video in its entirety twice, I have to say their version makes a heck of a lot more sense than the official version.