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The National Institute of Standards and Technology prepared the original report on the collapses of the WTC buildings, which was released in 2002. It did not even mention Building 7. This was because Bldg. 7 was not hit by a plane, came down at freefall acceleration for the first 100 feet, and came straight down in a symmetrical collapse into its own footprint, and NIST had no explanation, so they just left it out. That's quite an omission. It wasn't until about 2009 that NIST released their report on Bldg. 7, claiming that the 47-story fire-proofed steel structure collapsed because fire destroyed one column, and the failure of that one column precipitated a global collapse. This explanation, which is similar to the explanation for the collapse of Bldgs. 1 and 2, violates the laws of physics. The only way an object can descend at freefall acceleration is if there is absolutely no resistance from below. There were about 60,000 tons of structural steel below, which would require a tremendous amount of energy, which would be transferred from the descending mass to the remaining structure, and thus the acceleration would be significantly less than freefall. Also, the fact that the collapses of all 3 buildings were straight down can only be explained by the fact that all of the columns at every level all failed at precisely the same instant. The probability that a fire starting at one corner of the building would damage all columns, all carrying different loads and all being different sizes, to their individual failure points all at the same instant, is too small to calculate. And this occurred not at just one level, but every level. This makes the event sequence that much more improbable. Add to this the fact that the structural members become larger and more massive the lower the mass descends, and the concept of a lighter top structure crushing a heavier lower structure, through the path of greatest resistance, is an untenable story. The buildings failed in a sudden, brittle manner, like they were made of glass, and not the very ductile steel which is designed by metallurgists specifically to have a very predictable response to overload by ensuring that it has a wide elastic range where the material acts like a spring, and with increasing overload there is a wide plastic range where the material deforms like taffy without any increased resistance to load, followed by a strain-hardening range where the failure planes begin to interlock, which provides increasing resistance to load, up to the failure point. All of these deformations absorb energy, and are clearly visible to the naked eye, as well as being detectable with unaided hearing. All these considerations make freefall collapse due to normal overloading impossible. The only mechanism available to make these collapses happen the way that they did is controlled demolition. All the specimens of the dust spread over lower Manhattan contain microspheres of iron, as well as aluminum oxide and chips of unexploded nanothermite. These are the compounds that result from combustion of nanothermite. Nanothermite is an ultra-fine powdered combination of iron oxide and aluminum. During the ignition, the aluminum captures the oxygen from the iron oxide to form molten iron and aluminum oxide. The molten iron in freefall forms a perfect sphere, just as droplets of water from a spray bottle. When NIST was asked if they found any evidence of nanothermite, they replied that they had not. They were then asked if they looked for it, and they replied that they had not. Pretty hard to find something you're not looking for. The final evidence that nanothermite was used are the NASA infrared satellite photos taken 3 weeks after 9/11 showing temperatures of the basements to be 1800 degrees. Remember that jet fuel only burns at a temperature of 1600 degrees, and steel melts at 2800 degrees, and that nanothermite produces 4850 degrees. In conclusion, all the forensic evidence points to the scientific conclusion that nanothermite charges caused the collapse of all three World Trade Center buildings on 9/11/01.

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