Oliver no offense but constantly saying that over and over is not helping anything.. The only thing that's going to shut chistophera up is if we find evidence that the core of the steel shafts were concrete. What relation this has to the original question in the post, I have no idea; I've already pointed out that the buildings did not fall at free fall speeds, but chris does not care about that, so he's not trying to prove a conspiracy theory obviously. He just wants to prove that there was a concrete core.