@jeffw The twin towers were felled by a controlled demolition. Nano-thermate particles were found on site. Let's not forget building seven, which was not hit by a plane, yet also pancaked in a controlled demolition.
The official government conspiracy theory is bullshit. The presence of thermite proves it was a demolition.
"In this paper I focus on the application of the scientific method to the study of what really happened on 9/11/2001, particularly in the destruction of the World Trade Center buildings. There is something here to look at in depth: this is serious business. It is not just “nutty fringe science” or “conspiracy theory” that can be rejected without even considering the data. There is need for scientific scrutiny as I hope to demonstrate in this paper. In fact my colleagues and I now feel that we have sufficient data to conclude that the collisions of jets with the two Towers are NOT sufficient to explain the complete and rapid collapses of both Towers and WTC 7. We conclude that the evidence is compelling that the destruction of the WTC buildings involved planted cutter charges (such as explosives and incendiaries). We will consider this evidence."
"Abstract: We have discovered distinctive red/gray chips in all the samples we have studied of the dust produced by the destruction of the World Trade Center. Examination of four of these samples, collected from separate sites, is reported in this paper. These red/gray chips show marked similarities in all four samples. One sample was collected by a Manhattan resident about ten minutes after the collapse of the second WTC Tower, two the next day, and a fourth about a week later. The properties of these chips were analyzed using optical microscopy, scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (XEDS), and differential scanning calorimetry (DSC). The red material contains grains approxi- mately 100 nm across which are largely iron oxide, while aluminum is contained in tiny plate-like structures. Separation of components using methyl ethyl ketone demonstrated that elemental aluminum is present. The iron oxide and aluminum are intimately mixed in the red material. When ignited in a DSC device the chips exhibit large but narrow exotherms oc- curring at approximately 430 ˚C, far below the normal ignition temperature for conventional thermite. Numerous iron-rich spheres are clearly observed in the residue following the ignition of these peculiar red/gray chips. The red portion of these chips is found to be an unreacted thermitic material and highly energetic."