Yes, and not only here obviously. The subject is covered very well IMO in wiki and on Youtube. I think if it was not a terrorist attack but something else entirely we'd already know it for sure. It's impossible to hide something that's so important in the modern world.
Millions of people 'know' with pretty high precision what 9/11 was all about and how it went down. Many millions more know that the official story is false to one degree or another.....
Discussion about math and physics DOES NOT make all conspiracy theories impossible, only the ones that rely on impossible physical realities.
The thermite and nano-thermite theories are total bunko. Incidentally, to find evidence of thermite you'd look for aluminum compounds (including unburned thermite or that magical nano thermite) at the exact locations of the thermite "cutting torch." Nowhere else. Certainly not all over the city in dust that blew down.
More interestingly, it makes no sense to envision some guys conspiring saying "Hey, tell ya what. Let's get some stupid Muslims to fly planes into these towers, but hey, that'll just be a cover. What we'll really do is have about a couple dozen secret agents dressed in black sneak into those towers a couple days prior, and they'll put this magic nano-thermy stuff on all the steel beams. I know, it's gonna be hard to cut through all the walls and shit to get to those beams, but where there's a will there's a way. Oh, - and don't forget, they gotta put this stuff on the exact places those planes are going to hit."
I mean, if you think about it, that's crazy talk.