Which revision to the Loose Change docu-bullshit are you refering? They've re-done it a few times due to inaccuracies and moronic suppositions later debunked.

What are the physics of squeezing an accordian? (the blowing-out of mid and lower-story windows)

How does the foam fire-retardant protect the steel structure, when blasted-off by a 500 mph missle and the resultant explosion of fuel? What did that explosion do to the integrety of the structure? Remember...the fire didn't need to get hot enough to melt the steel, but just hot enough to bend it beyond load-bearing limits.

Ever seen a concrete block explode? I have. The gasses inside expand tremendously when subjected to fire.

If trying to save large building "A" do you even give a crap about small building "B", which was set alite by building "A" debris, which in turn lit the emergency back-up generator and it's fuel supply? Especially in the light of the many firefighters lost in building "A"?

Those that misunderstand physics should remain on the sidelines till they do understand.

9/11 "truthers" are kinda like the nazi holocaust deniers. Ignoring the facts to suit their misunderstanding of the situation. :jointsmile:
"truthers"...now that's funny.