A poster commented below on the World Trade Center collapse.
The National Institute of Standards and Technology has done a massive study
I sorta think if they had found evidence of explosives being used, they might have mentioned it in the summary.
But it's a long study, I haven't read it (much less in detail), and it could say something in a footnote somewhere.
The public has a chance to comment. Sander Hicks
, for example.
I can't actually read it, thanks to the Adobe AutoCrash(TM) feature that is working so nicely today, but maybe someone can and will let us know what it says.