you say there was no dust, but you must say that the concrete was transformed to micron size particles. So which is it?
Look up a video of concrete being dropped, and you see what are the "expected gradations in fragment size". Dust, c. 1%, rest big pieces/small pieces/crumbles.
I didn't say there was no concrete dust. Of course there was. I said the concrete ended up as expected, in pieces of varying size. That includes dust.
But while you're here - what's your source for the idea that all the WTC concrete was "pulverised to dust" ?
