911 Questions:Ok, you asked for it.....

Ok, if you really want me to get technical.
After all, I am an Engineer.
This is a very limited excerpt from one of thousands of analyses done on the WTC collapse. I suggest you visit the whole article to see the photos,etc. Again, the is just one appendix article that recommends further analysis.
I very strongly recommend that everyone visit Scholars for 9-11 Truth and Justice

Jonathan Barnett
Ronald R. Biederman

R. D. Sisson, Jr.

CLimited Metallurgical Examination
C.1 Introduction
Two structural steel members with unusual erosion patterns were observed in the WTC debris field. The first appeared to be from WTC 7 and the second from either WTC 1 or WTC 2. Samples were taken from these beams and labeled Sample 1 and Sample 2, respectively. A metallurgic examination was conducted.

C.2 Sample 1 (From WTC 7)
Several regions in the section of the beam shown in Figures C-1 and C-2 were examined to determine microstructural changes that occurred in the A36 structural steel as a result of the events of September 11, 2001, and the subsequent fires. Although the exact location of this beam in the building was not known, the severe erosion found in several beams warranted further consideration. In this preliminary study, optical and scanning electron metallography techniques were used to examine the most severely eroded regions as exemplified in the metallurgical mount shown in Figure C-3. Evidence of a severe high temperature

Ok, are your eyes glazing yet? I happen to enjoy reading things like this. All the women in my life point this out as one of the main reasons I am currently single.
Point is, there is sulfur deposited on the melted steel. At the temperatures the steel experienced, this is highly unusual when you take it in the overall context.

[...]

The origin of the steel shown in Figure C-9 is thought to be a high-yield-strength steel removed from a column member. The steel is a high-strength low-alloy (HSLA) steel containing copper. The unusual thinning of the member is most likely due to an attack of the steel by grain boundary penetration of sulfur forming sulfides that contain both iron and copper. Figures C-10, C-11, and C-12 show the region of severe corrosion at different levels of magnification.

I think I'm done mentally waterboarding you now. I just wanted to prove the point that these studies are done by actual scientists.
Let's skip to the conclusion of this body of analysis.

[...]
Suggestions for Future Research

The severe corrosion and subsequent erosion of Samples 1 and 2 are a very unusual event. No clear explanation for the source of the sulfur has been identified. The rate of corrosion is also unknown. It is possible that this is the result of long-term heating in the ground following the collapse of the buildings. It is also possible that the phenomenon started prior to collapse and accelerated the weakening of the steel structure. A detailed study into the mechanisms of this phenomenon is needed to determine what risk, if any, is presented to existing steel structures exposed to severe and long-burning fires(emphasis added).

This is my main point in this whole issue.
If we don't know technically why something happened, we don't know if it can happen again by accident or on purpose.
There is another paper that makes a very strong technical case for the type of sulfur observed being introduced by an outside substance. Oddly enough, it's the same type of sulfur deposit you get on steel when you use Thermite explosive in controlled implosions. I will let you explore that yourself and evaluate the evidence in the privacy of you own thoughts

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