NYC political environment, and given his connection to Guiliani, and all that that relationship could entail, it comes as no surprise to me that he would change his story from what he originally said when the politics of his statement were arguably less in play. I am also concerned on your reliance on NIST and its NCSTAR 1 report. It was a massive effort, but as James Quintiere, former Director of NIST's Fire research division, said to the 2007 World Fire Safety symposium, he has problems with NIST not allowing independent evaluation of the data, methods, and parameters NIST used to generate its report. He publicly called for that data to be released for independent evaluation. Particularly troubling are the "black box" computer simulations that when fed empirical data from actual experiments, the simulations failed to produce the collapse. Data was then entered to create more extreme conditions, with no factual basis for doing so other than to force a simulated collapse. That method is highly suspect, especially if the data and parameters are not transparent. Personally, I have looked carefully at the blueprints for WTC 1, and find no logical basis for the claim NIST makes that jet fuel fireballs collapsed walls, and created extreme heat in subbasement levels in the first 5 to 8 minutes after the plane struck the building. There was only ONE elevator shaft that ran from the strike zone to subbasement level 6 where this damage was reported by at least one of those