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Those videos show nothing but the last 30 seconds before collapse.
We can not know incontrovertibly that bombs were not placed in the buildings because,...
... as stated, despite multiple eyewitness accounts that suggest there could have been, that possibility was never investigated.
That's one of the things that puzzled me at the time. During most major incidents we are repeatedly informed that all lines of enquiry are being followed but it seems, during the events of September 2001, that certain leads were totally ignored.
At the very least it suggests that the "official story" had been decided on well before the time that any thorough investigation could have been completed.
More than enough evidence has been presented that shows that fire, in conjunction with impact damage, was quite capable of collapsing the WTC buildings and such evidence can be found in the horseshoe-shaped structural steel of the WTC buildings.
No sorry, no evidence and no explanation has been provided as to why the towers collapsed to ground level..
Civil & Structural Engineers on WTC Collapse
"The aircraft moved through the building as if it were a hot and fast lava flow," Sozen says. "Consequently, much of the fireproofing insulation was ripped off the structure. Even if all of the columns and girders had survived the impact - an unlikely event - the structure would fail as the result of a buckling of the columns.
The heat from an ordinary office fire would suffice to soften and weaken the unprotected steel. Evaluation of the effects of the fire on the core column structure, with the insulation removed by the impact, showed that collapse would follow whatever the number of columns cut at the time of the impact."
Apparently, the experts have spoken.
If I wanted to bring down the World Trade Centre buildings and I decided to try flying aircraft into them in order to do so would I lower my chance of success by also planting a number of bombs on select floors?
Doesn't it stand to reason that bombs exploding at various times after the planes hit would also weaken the structure far below the points of impact?
NOT as a way of eliciting a controlled demolition but just to weaken the whole building sufficient to assist in the eventual overall collapse?
This model is far closer to the eyewitness accounts than the idea of professional controlled demolition charges.
It doesn't stand to reason that you can try to refute this with an explanation of how legitimate, professional organisations bring about controlled demolitions because I am not talking about CD, I'm talking about bombs.
The Structural Engineering Community Rejects the Controlled-Demolition Conspiracy Theory
The structural engineering community rejects the controlled-demolition conspiracy theory. Its consensus is that the collapse of the World Trade Center buildings was a fire-induced, gravity-driven collapse, an explanation that does not involve the use of explosives.
14 years and counting and still no evidence for explosives.
originally posted by: NWOwned
a reply to: skyeagle409
Yes but, don't you have to first test for the presence of explosives, find none, AND THEN conclude they weren't used?
I mean as opposed to going with a speculative consensus of people's opinions without said testing?
So a group of people who weren't there, who did zero testing, and received no conclusive results, SAY it wasn't explosives?!
Is that right?
And still no explanation has been provided as to why the towers collapsed to ground level..
Why the World Trade Center Buildings Collapsed: A Fire Chief ’s Assessment
Bearing walls and Open floor design
When the jet liners crashed into the towers based upon knowledge of the tower construction and high-rise firefighting experience the following happened: First the plane broke through the tubular steel-bearing wall. This started the building failure. Next the exploding, disintegrating, 185-ton jet plane slid across an open office floor area and severed many of the steel interior columns in the center core area. Plane parts also crashed through the plasterboard-enclosed stairways, cutting off the exits from the upper floors.
The jet collapsed the ceilings and scraped most of the spray-on fire retarding asbestos from the steel trusses. The steel truss floor supports probably started to fail quickly from the flames and thecenter steel supporting columns severed by plane parts heated by the flames began to buckle, sag, warp and fail. Then the top part of the tower crashed down on the lower portion of the structure. This pancake collapse triggered the entire cascading collapse of the 110-story structure.
And no explanation as to where 3180* F came from, and on and on..
... that shocked the three “fire-wise professors” from Worcester Polytechnic Institute; that lead had been vaporized; that molybdenum had been melted; and that the metal pools contained iron that had been heated, as shown by the orange color, above 2,000°C (3,632°F).
Let's take a look here.
Steven Jones, not from the RJ Lee Group
originally posted by: skyeagle409
a reply to: wildb
They are talking metal flakes. What temperature does lead melt?
RJ Lee Group Dust Sample Report
Particles that either were formed as a consequence of high temperature or were modified by exposure to high temperature are important WTC Dust Markers for WTC Dust. Fires that were a part of the WTC Event produced combustion-modified products that traveled with other components of WTC Dust.
Considering the high temperatures reached during the destruction of the WTC, the following three types of combustion products would be expected to be present in WTC Dust. These products are:
• Vesicular carbonaceous particles primarily from plastics
• Iron-rich spheres from iron-bearing building components or contents
• High temperature aluminosilicate from building materials
Because lead would have melted long before 3000 degrees F. was reached.
Considering the high temperatures reached during the destruction of the WTC
The RJ Lee Group Report
The RJ Lee Group report considers samples taken several months after the collapses, and it is certain that torch-cutting of steel beams as part of the cleanup process contributed some, if not all, of the spherules seen in these samples.
www.metabunk.org...
Iron Burns
Sometimes a big load of iron in a ship can get hot. The heat can even set other materials on fire. That’s because the iron is rusting, which means it is burning very, very slowly. Iron rusts in a chemical reaction called oxidation. That means the iron reacts with oxygen gas from the air. Oxidation is the chemical reaction that occurs when anything burns in air. Like most oxidations, rusting gives off heat."
originally posted by: skyeagle409
a reply to: wildb
The RJ Lee Group Report
The RJ Lee Group report considers samples taken several months after the collapses, and it is certain that torch-cutting of steel beams as part of the cleanup process contributed some, if not all, of the spherules seen in these samples.
www.metabunk.org...
And, the fires, as indicated in the RJ Lee Group Report. In addition, we can also take a look here.
Iron Burns
Sometimes a big load of iron in a ship can get hot. The heat can even set other materials on fire. That’s because the iron is rusting, which means it is burning very, very slowly. Iron rusts in a chemical reaction called oxidation. That means the iron reacts with oxygen gas from the air. Oxidation is the chemical reaction that occurs when anything burns in air. Like most oxidations, rusting gives off heat."
.