Here's the most cogent, non-tin foil hat sounding arguments that I've seen:
http://milwaukee.indymedia.org/en/2006/03/205195.shtml

1. Fire had never before caused steel-frame buildings to collapse except for the three buildings on 9/11, 
nor has fire collapsed any steel high rise since 9/11.

2. The fires, especially in the South Tower and WTC-7, were small.

3. WTC-7 was unharmed by an airplane and had only minor fires on the seventh and twelfth floors 
of this 47-story steel building yet it collapsed in less than 10 seconds.

4. WTC-5 and WTC-6 had raging fires but did not collapse despite much thinner steel beams (pp. 68–9).
5. In a PBS documentary, Larry Silverstein, the WTC lease-holder, recalled talking to the fire department 
commander on 9/11 about WTC-7 and said, "…maybe the smartest thing to do is pull it," slang for demolish it.

6. FEMA, given the uninviting task of explaining the collapse of Building 7 with mention of demolition verboten 
admitted that the best it could come up with had "only a low probability of occurrence."

7. It’s difficult if not impossible for hydrocarbon fires like those fed by jet fuel (kerosene) to raise the 
temperature of steel close to melting.

Professional demolition, by contrast, can explain all of these facts and more. Demolition means placing 
explosives throughout a building, and detonating them in sequence to weaken "the structure so it collapses
or folds in upon itself". In conventional demolitions gravity does most of the work, although it probably did 
a minority on 9/11, so heavily were the towers honeycombed with explosives.

1. Each WTC building collapse occurred at virtually free-fall speed (approximately 10 seconds or less).

2. Each building collapsed, for the most part, into its own footprint.

3. Virtually all the concrete (an estimated 100,000 tons in each tower) on every floor was pulverized into 
a very fine dust, a phenomenon that requires enormous energy and could not be caused by gravity alone 
("…workers can’t even find concrete. ‘It’s all dust,’ [the official] said").

4. Dust exploded horizontally for a couple hundred feet, as did debris, at the beginning of each tower’s collapse.

5. Collapses were total, leaving none of the massive core columns sticking up hundreds of feet into the air.

6. Salvage experts were amazed at how small the debris stacks were.

7. The steel beams and columns came down in sections under 30 feet long and had no signs of "softening"; 
there was little left but shorn sections of steel and a few bits of concrete.

8. Photos and videos of the collapses all show "demolition waves," meaning "confluent rows of small explosions" 
along floors (blast sequences).

9. According to many witnesses, explosions occurred within the buildings.

10. Each collapse had detectable seismic vibrations suggestive of underground explosions, similar to the
2.3 earthquake magnitude from a demolition like the Seattle Kingdome (p. 108).

11. Each collapse produced molten steel identical to that generated by explosives, resulting in "hot spots" 
that persisted for months (the two hottest spots at WTC-2 and WTC-7 were approximately 1,350o F 
five days after being continuously flooded with water, a temperature high enough to melt aluminum (p. 70).

And an interesting look at the Pentagon.
http://www.pentagonstrike.co.uk/flash.htm#Main

I'm skeptical about the latter, but they do make a good case.

james 

 

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