one more thing about this paper, one of the main writer of the paper is  Professor Steven E. Jones, which is a physic proferssor in BYU, his college who is Professor Emeritus of Civil Engineering, and someone that should be more qualified to comment on the cause of the collapse refuted the finding in the paper.

  Letter to the Editor
Refuting 9/11 Conspiracy Theory

April 09, 2006

Dear Editor,

After reading in the Daily Herald the presentations made by Professor Steven E. Jones (BYU Physics) to students at UVSC and BYU, I feel obligated to reply to his "Conspiracy Theory" relating to the terrorist attacks on the World Trade Center (9/11/01).

I have studied the summary of the report by FEMA, The American Society of Civil Engineers and several other professional engineering organizations. These experts have given in detail the effects on the Towers by the impact of the commercial aircraft. I have also read Professor Jones' (referred to) 42 page unpublished report. In my understanding of structural design and the properties of structural steel I find Professor Jones' thesis that planted explosives (rather than fire from the planes) caused the collapse of the Towers, very unreliable.

The structural design of the towers was unique in that the supporting steel structure consisted of closely spaced columns in the walls of all four sides. The resulting structure was similar to a tube. When the aircraft impacted the towers at speeds of about 500 plus mph, many steel columns were immediately severed and others rendered weak by the following fires. The fires critically damaged the floors systems. Structural steel will begin to lose strength when heated to temperatures above 1000 degrees Fahrenheit. Steel bridge girders are bent to conform to the curved roadway by spot heating flanges between 800 and 1000 degrees Fahrenheit. It is easy to comprehend the loss of carrying capacity of all the structural steel due to the raging fires fed by the jet's fuel as well as aircraft and building contents.

Before one (especially students) supports such a conspiracy theory, they should investigate all details of the theory. To me a practicing structural engineer of 57 continuous years (1941-1998), Professor Jones' presentations are very disturbing.

D. Allan Firmage

Professor Emeritus, Civil Engineering, BYU

You are presenting a 2006 email to rebuke a 2009 science paper?

ok my mistake,Prof Allan Firmage email was refering to the 2005 paper by Prof Jones that said explosive cause the building to collapese, not nano thermite.

Even then, a simple short email to debunk a 42 page report, and using his 'credentials' instead of tackling the entire paper with his own counter-thesis, instead resorting to 'conspiracy theory' labeling, very much tells me that I have to beware of this Professor's credibility too, as he is resorting to character assassination instead of properly thought out science.
Anyway, do whatever you like. I know where I stand and others hopefully do too. It's pointless to shout who's got the biggest *toot* in this thread.

While you're at that, do read up on who is responsible for the WTC security and who owns the company, Securacom.

http://www.911hardfacts.com/report_09.htm
http://www.utne.com/2003-02-01/Secrecy-Sur...estigation.aspx

i am confuse now, the link talk about explosive being planted in the WTC. so which method do you believe have been used thermite or explosive?

Ok, robert ngo, you can shift your attention to Niels Harrit and assassinate his character now.

Come on show me the familiar 'Conspiracy Theorist' insult. Come on Robert Ngo, YOU CAN DO IT!

Ordinary thermite ignites at a much higher temperature
(about 900 °C or above) and gives a significantly broader
trace than super-thermite [21]. All these data suggest that the
thermitic material found in the WTC dust is a form of nanothermite,
not ordinary (macro-) thermite. We make no attempt
to specify the particular form of nano-thermite present
until more is learned about the red material and especially
about the nature of the organic material it contains.

These observations
reminded us of nano-thermite fabricated at the Lawrence
Livermore National Laboratory and elsewhere; available
papers describe this material as an intimate mixture of UFG
aluminum and iron oxide in nano-thermite composites to
form pyrotechnics or explosives [19-21]. The thermite reaction
involves aluminum and a metal oxide, as in this typical
reaction with iron oxide:

Source from USA DOD and William Cohen.

http://www.defense.gov/transcripts/transcr...ranscriptid=674

Q: Let me ask you specifically about last week's scare here in Washington, and what we might have learned from how prepared we are to deal with that (inaudible), at B'nai Brith.

A: Well, it points out the nature of the threat. It turned out to be a false threat under the circumstances. But as we've learned in the intelligence community, we had something called -- and we have James Woolsey here to perhaps even address this question about phantom moles. The mere fear that there is a mole within an agency can set off a chain reaction and a hunt for that particular mole which can paralyze the agency for weeks and months and years even, in a search. The same thing is true about just the false scare of a threat of using some kind of a chemical weapon or a biological one. There are some reports, for example, that some countries have been trying to construct something like an Ebola Virus, and that would be a very dangerous phenomenon, to say the least. Alvin Toeffler has written about this in terms of some scientists in their laboratories trying to devise certain types of pathogens that would be ethnic specific so that they could just eliminate certain ethnic groups and races; and others are designing some sort of engineering, some sort of insects that can destroy specific crops. Others are engaging even in an eco- type of terrorism whereby they can alter the climate, set off earthquakes, volcanoes remotely through the use of electromagnetic waves.

So there are plenty of ingenious minds out there that are at work finding ways in which they can wreak terror upon other nations. It's real, and that's the reason why we have to intensify our efforts, and that's why this is so important.
http://www.youtube.com/watch?v=OcHPAR_5TEc

If you don't agree, discuss.
But remember, this source is reliable, and right from the horse's mouth.

And I am bit surprised they're accusing 'terrorists' of possessing such weapons, when they should point at themselves instead, since we know there's nothing terrorists could obtain that the US Military not already possess in a more advanced form.