Just to light a firecracker . . . .
Scientists at Purdue University have completed a two-year study and produced a computer simulation demonstrating how single airliners were able to bring down the World Trade Center towers in New York on 9/11.
The purpose of the study was to give structural engineers information on how these kinds of structural failures can be prevented in future events.
You can read the story and activate the simulation here:
http://www.purdue.edu/uns/x/2007a/07...ffmannWTC.html
No doubt there will be some out there who will disagree with this.
Cowperson