I don’t know what to think of 9/11 conspiracy theories. On the one hand, I believe the government can lie to us, and has in the past. On the other hand, I have a hard time believing that the government would or could kill those people for a political purpose. So, here are some links if you’re interested in big conspiracies.
http://en.wikipedia.org/wiki/9/11_conspiracy_theories
Popular Mechanics debunks 9/11 theories here:
http://www.popularmechanics.com/technology/military_law/1227842.html
