This was not a PBS production.
"Three years ago I wrote a column headlined "PBS, Yes and No." It dealt with controversial episodes in which the public had reason to believe PBS was associated in some fashion with a certain television program yet PBS, as a broadcasting service, didn't have anything to do with it.
One of those episodes involved a series of programs being aired as part of a fund-raising pledge drive by the PBS-member station in Denver, KBDI. The films were produced by an organization known as "Architects and Engineers for 9/11 Truth" that claimed the film "9/11: Blueprint for Truth" offers "evidence that all three World Trade Center high-rises were destroyed not by fire and damage, but by explosive-controlled demolitions on September 11, 2001."
In other words, I wrote at the time, "someone wired these buildings with explosives intending to bring them down in this attack, and this has been covered up by the government, the 9/11 Commission and the mainstream media." I also wrote that "on a personal level I find the idea embedded in 'Blueprint' of a government conspiracy to blow up those buildings to be preposterous and simply beyond belief and I fault the station for promoting this as part of a pledge drive and presenting it without an accompanying on-the-air program in which critics have their say."
http://www.pbs.org/ombudsman/2012/09/the_disaster_that_keeps_on_giving_1.html
http://www.popularmechanics.com/technology/military/news/1227842
http://www.popularmechanics.com/technology/military/news/4220721
"Sooner or later, every conspiracy theory comes down to some factual claim that, if true, would be at odds with the conventional account of September 11. For example, the claim that "jet fuel doesn't burn hot enough to melt steel" is used to suggest that the fires that followed weren't hot enough to cause the subsequent collapses. After all, if fire didn't bring down the towers, what did? Conspiracy theorists often repeat the refrain that "we're just asking questions." In practice they are eager to start supplying answers: The Towers were felled by bombs, thermite, secret demolition squads or some other cause. But what about those underlying factual claims? Are they accurate? We wanted to find out.
Our method was simple: Rather than try to tell the entire story of what did happen on September 11, we worked to assess the claims that conspiracy theorists themselves present as the foundations of their arguments. This is an important distinction often missed by conspiracy theorists who criticize PM's work. There is an enormous body of evidence--documents, engineering studies, forensic data, eyewitness accounts--that supports the mainstream view of September 11. Conspiracy theorists ignore or discount the vast bulk of this material and focus relentlessly on their small handful of anomalies. (Scientific American columnist Michael Shermer has an excellent piece on the fallacy of arguing from anomaly.)
We took conspiracy theorists at their word when they said they wanted to understand these anomalous facts. We dug as deeply as we could for answers. In every case that PM has investigated to date, the very evidence 9/11 conspiracy theorists use to support their arguments have turned out to be mistaken, misinterpreted or taken wildly out of context."
Read more: Debunking 9/11 Myths - Frequently Asked Questions - Conspiracy Theories - Popular Mechanics
Follow us: @PopMech on Twitter | popularmechanics on Facebook
Visit us at PopularMechanics.com
"The mistaken belief that a handful of unexplained anomalies can undermine a well-established theory lies at the heart of all conspiratorial thinking (as well as creationism, Holocaust denial and the various crank theories of physics). All the "evidence" for a 9/11 conspiracy falls under the rubric of this fallacy. Such notions are easily refuted by noting that scientific theories are not built on single facts alone but on a convergence of evidence assembled from multiple lines of inquiry."
"For example, according to www.911research.wtc7.net, steel melts at a temperature of 2,777 degrees Fahrenheit, but jet fuel burns at only 1,517 degrees F. No melted steel, no collapsed towers. "The planes did not bring those towers down; bombs did," says www.abovetopsecret.com. Wrong. In an article in the Journal of the Minerals, Metals, and Materials Society and in subsequent interviews, Thomas Eagar, an engineering professor at the Massachusetts Institute of Technology, explains why: steel loses 50 percent of its strength at 1,200 degrees F; 90,000 liters of jet fuel ignited other combustible materials such as rugs, curtains, furniture and paper, which continued burning after the jet fuel was exhausted, raising temperatures above 1,400 degrees F and spreading the inferno throughout each building. Temperature differentials of hundreds of degrees across single steel horizontal trusses caused them to sag--straining and then breaking the angle clips that held the beams to the vertical columns. Once one truss failed, others followed. When one floor collapsed onto the next floor below, that floor subsequently gave way, creating a pancaking effect that triggered each 500,000-ton structure to crumble. Conspiricists argue that the buildings should have fallen over on their sides, but with 95 percent of each building consisting of air, they could only have collapsed straight down."
http://www.scientificamerican.com/article.cfm?id=fahrenheit-2777