Here are just a few of the witnesses and recordings that NIST says DO NOT exist.
You be the judge.

Here’s NIST’s Statement from their website “Did investigators consider the possibility that an explosion caused or contributed to the collapse of WTC 7?
Yes, this possibility was investigated carefully. NIST concluded that blast events inside the building did not occur and found no evidence supporting the existence of a blast event.

In addition, no blast sounds were heard on the audio tracks of video recordings during the collapse of WTC 7 or reported by witnesses. …”

Bilayered Chip

Active Thermitic Material
Unexploded Energetic Materials Found in WTC Dust
In November of 2007, Steven E. Jones, having earlier shown the presence of aluminothermic residues in World Trade Center dust samples in the form of solidified iron-rich droplets, announced his discovery of particles of unreacted thermitic materials, in the form of bi-layered chips with gray and red layers. The chips, which are attracted by a magnet, have about the thickness of an eggshell but are much tougher. The red layers have elemental compositions similar to commercial thermite, and to the iron-rich droplets, according to Jones, with spikes for oxygen, iron, aluminum, potassium, and silicon. Jones describes experiments in which the chips burn vigorously when ignited by a torch. 1

One difference between the composition of the red layers and that of simple thermite preparations is the layers’ abundance of carbon and silicon. The significance of the carbon would become more clear as Jones and his collegues continued to study the samples and research the state of the art of high-tech aluminothermics in 2001. Carbon and silicon are often major constituents of energetic nano-composites or “super-thermites”, forming a matrix that holds the nano-sized iron oxide and aluminum particles in close proximity within a tough, stable material. Additionally, silicon oxides may participate in the thermite reaction as oxidizers of aluminum, and carbon compounds may increase the explosive power of such preparations by generating high gas pressures.

Detailed Analysis of the Chips Provided by 2009 Paper
In April of 2009, the paper Active Thermitic Material Discovered in Dust from the 9/11 World Trade Center Catastrophe documented the detailed analysis of the red-gray chips that had been performed by the authors using analytical instruments such as scanning electron microscopy with X-ray energy-dispersive spectroscopy and differential scanning calorimetry. 2 The paper, summarized in the essay Explosives Found in World Trade Center Dust, includes detailed descriptions of the physical structure of the chips, the chemical compositions of their components, and the chips’ thermal behavior.

Portion of Fig. 4 from Active Thermititic Material Discovered. The corner of a red-gray chip, with the gray and red layers labeled.
The gray layers are a homogeneous material consisting mostly of iron and oxygen, whereas the red layers are a nano-structured composite material, in which thin plates of mostly elemental aluminum and faceted grains of mostly oxides of iron are embedded in a mesoporous material of mostly silicon and oxygen. The plates and grains, which are highly consistent in shape and size, are only 40nm thick and 100nm in diameter, respectively.

References

1. Dr. Steven E. Jones Announces New Discovery: Red/gray Bi-layered Chips in WTC Dust, stj911.org, 12/15/2007
2. Active Thermitic Material Discovered in Dust from the 9/11 World Trade Center Catastrophe, The Open Chemical Physics Journal, 4/3/2009

1. Demolition explosives leave evidence of their use, just like fingerprints at a crime scene. The “fingerprint”of Thermite (an incendiary explosive which cuts through steel) was conclusively identified in samples from the World Trade Center by Physics Professor Dr. Steven E. Jones. Additional samples from Ground Zero examined by Chemist Kevin Ryan and other scientists also conclusively identified conditions consistent with the use of demolition charges. Documentation of billions of microspheres containing molten metal from the chemical signature of Thermite can be found in the BPAT Report from FEMA; the Report of the United States Geological Survey; and the report of RJ Lee Group (the company hired by the WTC insurance company to conduct an independent private study). Those findings should have led to investigation procedures determined by the National Fire Protection Association:

NFPA very clearly states melted steel or concrete is a sign of exotic accelerants. Therefore, the
debris should have been thoroughly analyzed for exotic accelerants, specifically Thermite.

Click on the link below to see all 17 Smoking Guns
The Smoking Guns of 9/11