I've been barking up this tree since day one. Champagne glass + tuning fork of certain pitch = we all know; same frequencies directed at each other cancels each other out soooooo.....

how hard would it be for a military type organization ( or the CIA ) to figure out the resonant frequency of steel, iron and concrete? Probably not hard at all. Said it a few times here, I've known about 'frequency weapons' / DEW's since high school ( early 90s ) and this was my immediate thought when this happened.

The towers don't free fall per se; they almost peel open like bananas, and notice how instantly the debris turns to dust AS it's falling.