@HexHammer,
Quote:- Tower 7 was an empty building, and had been empty for a while, if the support pillars had been pre-fixed prior 9/11, it woldn't take much to make the final damage to the support pillars, causeing a progressive collaps.
If? That is your evidence? an if? For that matter IF aliens had used a transporter to make the column move to a different position it would have caused a progressive collapse but that isn't evidence that they did so.
Quote:- you don't need a blast to make fatal damage to support pillars, pnumatic crush can also do it,
A pneumatic crush? How would you crush the column while it was supporting the building weight? For that matter where would you get a pneumatic system that could crush columns of that size? With physics you need a system that can support more weight than the column can in order to crush the column. I know of no portable system that exists that is capable of that strength.
Quote:
which causes no shockwave
When you can explain how it can be done from an engineering standpoint then we can look at the sound it would cause.
Quote:as shaped charges or other kind of blast demolition. Or Termite can also do the job. There are many other possebilities.
That is one big Termite to eat it's way through a steel column.
I'm sure you can come up with lots of other possibilities that are impossible. Reality however points to the damage from the tower collapse and the fires that were allowed to burn for hours as the cause of the collapse.