Do we really know what happened?

Cover of report released by the Department of Justice prior to 9/11.

The following are links to videos proposing some answers to 9/11. They are lengthy, but deserve to be seen.

http://video.google.com/videoplay?docid=-2023320890224991194
http://video.google.com/videoplay?docid=-8260059923762628848
http://video.google.com/videoplay?docid=6545313046180631815