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The destruction of WTC 1 and 2
The official story goes like this:
American Airlines flight 11 hit the north tower (WTC1) at 08.46 AM. United Airlines flight 175 hit the south tower (WTC2) at 09.03 AM. The structural damage done to the buildings by the impacts and the following raging infernos fed by the kerosene from the planes caused the steel trusses to melt what ultimately let to a progressing pancake collapse. Floors would cave in and fall on the floors beneath it and so on, starting at the top and going all the way down. At 09.59 AM, WTC2 collapses, followed by WTC1 at 10.28 AM.
That's a good story but I don't believe it. Structural steel doesn't melt at the temperatures that can be reached by an hydrocarbon fueled fire. Under perfect conditions the maximum temperature that can be reached by hydrocarbons such as jet fuel burning in air is 825 - 1100 C (Depends on what source you believe). But it would take a constant and even feed of air and fuel for a long period of time to reach such temperatures. There wasn't a constant feed of kerosene, a major part of the fuel burned on impact in the big explosions we all saw. And the rest was used by the fire within minutes after impact. Even the National Institute of Standards and Technology agrees on that. After a three year investigation NIST has also said that "there is no proof that any of the core columns experienced temperatures in excess of 250 C". The alleged "blazing infernos" at the impact zones are not supported by photographic evidence. See the Fire section in the photo pages.
NIST says " The melting point of steel is about 1,500 Celsius". Normal building fires and hydrocarbon (e.g., jet fuel) fires generate temperatures up to about 1,100 degrees Celsius. NIST reported "maximum upper layer air temperatures of about 1,000 degrees Celsius in the WTC towers". They add that structural steel loses it's strength by temperatures exceeding 1000 degrees Celsius.
But even in the unrealistic case that the steel structure reached temperatures exceeding 1500 degrees celsius at the impact zones, do you really think that that would make the steel at, let's say, 30 floors lower where there was no fire at all, any weaker? Give me a break here. The parts of the buildings above the impact zones coming down because of the fires, well ok, I might even believe that. But the break down should have stopped pretty soon after the impact areas collapsed. period.
Two 110 floor towers that collapse into their own basements after 1 hour 13 minutes (WTC2) and 1 hour 25 minutes (WTC1) of smoke. Tower 1 was hit first but collapsed last, it was hit between floors 92 and 98. WTC2 was hit last but fell first. It was hit between floor 78 and 84. They collapse straight down, right through the path of most resistance and they both fell neatly into their own footprint. And they both fell in less than 13 seconds. They came down in free fall speed which is pretty remarkable considering the fact that it was supposed to be pancake collapses. With one floor falling on the other and busting it's way through. If that is what happened, the collapses should have slowed down and come to a stop somewhere. But instead of that, both towers picked up speed during the collapse. The floors didn't slow the fall AT ALL. If these were pancake collapses, where are the piles of floors (see here, here and here) then?? Why did all the concrete turn into a fine dust? And more important, if these were pancake collapses why did the two massive cores, build round 47 steel columns each, come down and disappear from Ground Zero??
NIST stated that they "are unable to provide a full explanation of the total collapse." As far as I'm concerned the explanation is pretty simple. The use of explosive materials.
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