9/11 conspiracies debunked

In a similar genre to the theories that men never walked on the Moon as a result of the Apollo program (and Gemini and Mercury before that), a proportion of the populous carries the idea that the horrific atrocities of 9/11/01 were the work of groups within the U.S. government. A thoughtful discussion and refutation of a number of these theories is found at

http://www.popularmechanics.com/science/defense/1227842.html