You question credential and use a word like expert (un named no less = no credentials)- yes, I asked for the discussion and I WILL dictate the rules of engagement- don't like it- go play in your own sand box.Experts still say the stress of the buildings from the fires and missing supports added weight and stressed the steel below to collapse.
The twin towers collapsed in near identical fashion even though they were hit in different locations, at near free fall speed - free fall, means no resistance- near free fall means a little resistance, as in some- the fires were not of high enough sustained temperature which is what it would take to weaken 5in flanged I beams, which were the center (core) supports- sustained temps. Not ignition temps which are really hot for a short period of time- the fires were temporary and lasted only as long as there was fuel available- as in burned off, meaning not sustained, and as fuel burns it loses heat/temp. The offices have fire resistant mat'l and resist flaming, then melt or disintegrate- voila!, no more fuel. There are images (in the videos) of explosions and there are interviews with Firemen who heard explosions.
The weight of the structure above where the planes hit started the collapse, and should have toppled, not collapsed- the rest was rigged- the mass below the tops was strong enough to support the weight from above, but didn't. How is that possible given the over engineering of steel structures? Yes, over engineering. It's common practice to build with a fudge factor of at least 20%- common practice. Why? Public safety and law suits. Why no law suits if there was structural weakness? Why no investigation(s) to determine if that was really the cause?
As for how all this was rigged- that's the reason there should have been a thorough investigation. The 9/11 commission's job was to try to figure out how to prevent it from happening again- not investigate what failed in the structures- also, there was evidence of thermite in the rubble- also the rubble was immediately removed (well as immediately as possible) and kept under a secure location and I doubt you could find it now with a map- I saw pictures of cut steel that didn't come from a torch- there are just too many odd events that point to gov't lies- call it whatever disparaging word you choose- lie is lie- the US gov't has a long, long history of lying- whose fault is that? Mine? Your's? LARAM's? No, it is its fault. How can I be persuaded otherwise? Prove I'm wrong. They can't. There will never be a thorough, unbiased (gov't influenced) investigation just like there will never be any trials for the POW's in Gtimo, just like there was never a thorough, unbiased (lack of gov't influence/prejudice) about JFK- and our gov't representatives are just people. They are not saints, though they pretend to be and many believe them to be and are willing to accept "expert" analysis - the expertise is selling, as you call it, bullshit.
So, was/is it a "conspiracy"? Maybe, maybe not. But, one thing is for sure- complicit is abundant. Lies are the history of the fed gov't. The CIA is probably the most corrupt crime organization on the planet, in history, and to this day it refuses to cooperate with people (outside the gov't, sometimes within the gov't) with the JFK assassination "experts" not employed by the fed gov't. And the experts, not employed by the fed gov't have credentials that are credible- not gov't sourced (though in some instances in the 9/11 debacle there are some gov't employees who have told their story) who have spent years researching/investigating his assassination- and now the same can be said about 9/11- the fed gov't is the one with the lack of credibility- not the civilians.
How many floor collapsed in the North Tower...how many in the South Tower. Meaning...how many of the floors were still around on 9/12. Do you know?