9/11 belief, mythology, and the unknowable (OT)

Marvin Sirbu, professor of engineering and public policy at Carnegie Mellon University said on September 14, 2001, that "The fact of the matter is that cell phones can work in almost all phases of a commercial flight

According to Mete Sozen, a professor of structural engineering at Purdue University, a crashing jet doesn't punch a cartoon-like outline of itself into a reinforced concrete building. When Flight 77 hit the Pentagon, one wing hit the ground and the other was sheared off by the Pentagon's load-bearing columns.[83] According to ArchitectureWeek, the reason the Pentagon took relatively little damage from the impact was because Wedge One had recently been renovated.[86] (This was part of a renovation program which had been begun in the eighties, and Wedge One was the first of five to be renovated.[87])

Airplane debris including Flight 77's black boxes,[88] the nose cone, landing gear,[89] an airplane tire,[90] the fuselage,[citation needed] and an intact cockpit seat[91] were observed at the crash site. The remains of passengers from Flight 77 were found at the Pentagon crash site and their identities confirmed by DNA analysis.[92] Many eyewitnesses saw the plane strike the Pentagon. Further, Flight 77 passengers made phone calls reporting that their airplane had been hijacked. For example, passenger Renee May called her mother to tell her that the plane had been hijacked and that the passengers had been herded to the back of the plane. Another passenger named Barbara Olson called her husband (U.S. Solicitor General Theodore Olson) and said that the flight had been hijacked, and that the hijackers had knives and box cutters.[5][83][93]

Criticism of the reports published by NIST on the destruction of the World Trade Center buildings plays a central role in theories about an alleged controlled demolition. The picture shows the simulated exterior buckling of 7 WTC during the collapse.

Why did NIST not consider a “controlled demolition” hypothesis with matching computer modeling and explanation as it did for the “pancake theory” hypothesis? A key critique of NIST’s work lies in the complete lack of analysis supporting a “progressive collapse” after the point of collapse initiation and the lack of consideration given to a controlled demolition hypothesis.

NIST conducted an extremely thorough three-year investigation into what caused the WTC towers to collapse, as explained in NIST’s dedicated Web site, http://wtc.nist.gov. This included consideration of a number of hypotheses for the collapses of the towers.

Some 200 technical experts—including about 85 career NIST experts and 125 leading experts from the private sector and academia—reviewed tens of thousands of documents, interviewed more than 1,000 people, reviewed 7,000 segments of video footage and 7,000 photographs, analyzed 236 pieces of steel from the wreckage, performed laboratory tests and sophisticated computer simulations of the sequence of events that occurred from the moment the aircraft struck the towers until they began to collapse.

Based on this comprehensive investigation, NIST concluded that the WTC towers collapsed because: (1) the impact of the planes severed and damaged support columns, dislodged fireproofing insulation coating the steel floor trusses and steel columns, and widely dispersed jet fuel over multiple floors; and (2) the subsequent unusually large jet-fuel ignited multi-floor fires (which reached temperatures as high as 1,000 degrees Celsius) significantly weakened the floors and columns with dislodged fireproofing to the point where floors sagged and pulled inward on the perimeter columns. This led to the inward bowing of the perimeter columns and failure of the south face of WTC 1 and the east face of WTC 2, initiating the collapse of each of the towers. Both photographic and video evidence—as well as accounts from the New York Police Department aviation unit during a half-hour period prior to collapse—support this sequence for each tower.

NIST’s findings do not support the “pancake theory” of collapse, which is premised on a progressive failure of the floor systems in the WTC towers (the composite floor system—that connected the core columns and the perimeter columns—consisted of a grid of steel “trusses” integrated with a concrete slab; see diagram below). Instead, the NIST investigation showed conclusively that the failure of the inwardly bowed perimeter columns initiated collapse and that the occurrence of this inward bowing required the sagging floors to remain connected to the columns and pull the columns inwards. Thus, the floors did not fail progressively to cause a pancaking phenomenon.



Diagram of Composite WTC Floor System

NIST’s findings also do not support the “controlled demolition” theory since there is conclusive evidence that:

the collapse was initiated in the impact and fire floors of the WTC towers and nowhere else, and;

the time it took for the collapse to initiate (56 minutes for WTC 2 and 102 minutes for WTC 1) was dictated by (1) the extent of damage caused by the aircraft impact, and (2) the time it took for the fires to reach critical locations and weaken the structure to the point that the towers could not resist the tremendous energy released by the downward movement of the massive top section of the building at and above the fire and impact floors.

Video evidence also showed unambiguously that the collapse progressed from the top to the bottom, and there was no evidence (collected by NIST, or by the New York Police Department, the Port Authority Police Department or the Fire Department of New York) of any blast or explosions in the region below the impact and fire floors as the top building sections (including and above the 98th floor in WTC 1 and the 82nd floor in WTC 2) began their downward movement upon collapse initiation.

In summary, NIST found no corroborating evidence for alternative hypotheses suggesting that the WTC towers were brought down by controlled demolition using explosives planted prior to Sept. 11, 2001. NIST also did not find any evidence that missiles were fired at or hit the towers. Instead, photographs and videos from several angles clearly show that the collapse initiated at the fire and impact floors and that the collapse progressed from the initiating floors downward until the dust clouds obscured the view.

Some 200 technical experts—including about 85 career NIST experts and 125 leading experts from the private sector and academia—reviewed tens of thousands of documents, interviewed more than 1,000 people, reviewed 7,000 segments of video footage and 7,000 photographs, analyzed 236 pieces of steel from the wreckage, performed laboratory tests and sophisticated computer simulations of the sequence of events that occurred from the moment the aircraft struck the towers until they began to collapse.

In a famous book by Antoine de Saint Exupery, a little prince from another planet asks the narrator to draw a sheep. After several unsatisfactory attempts, the narrator simply draws a box and tells the little prince that the sheep is in the box. The little prince then exclaims -- "That is exactly the way I wanted it!"

Just so, the Bush Administration asked its scientists at the National Institute of Standards and Technology (NIST) for an explanation as to what happened at the World Trade Center (WTC) on 9/11. In response to this request, NIST drew up a series of fanciful stories over a period of years, each story differing from the previous one. Finally, after seven long years, NIST published its last story for WTC 7 by simply saying, in effect: "The explanation is in our computer."