Today, as the world pauses to remember the eleventh anniversary of the 9/11 terror attacks on the United States, it is also important to remember the inexplicable things that happened - and didn't happen - that tragic day. After all, 9/11 is solely responsible for diminishing hard-fought US civil rights, as well as triggering wars around the world. Here are 11 well documented mysteries of 9/11 that warrant an investigation into the two hours that changed the course of world history. 1. Why did the Bush administration allow numerous Saudi nationals, and, more importantly, the family of Osama bin Laden to leave the United States in the days following the events of 9/11? 2. How can we explain the huge increase in trading on airline stocks in the days before 9/11? 3. Why was there no disciplinary action taken against the individuals who were responsible for protecting America from attack? 4. Why was the Bush administration so adamantly opposed to conducting any sort of investigation into the events of 9/11? 5. Vanishing Act: WTC 7 6. Why was the US Air Force missing in action? 7. Why were President George W. Bush and his Vice President, Dick Cheney permitted to provide testimony to the 9/11 Commission on the condition that they present it in private and together? 8. No sign of crashed planes at the Pentagon and Shanksville, Pennsylvania. 9. Pentagon videos missing in action. 10. Black Boxes missing in action. 11. Hijackers ... alive and well?