A European scientific study concluded that the twin towers collapsed on 11 September 2001 through controlled demolition.
A study by four physicists and published in Europhysics Magazine says that "the evidence overwhelmingly leads to the conclusion that all three buildings were destroyed by controlled demolition."
As Wnd.com reports:
“Given the far-reaching consequences, it is morally imperative for this hypothesis to become the subject of a truly scientific and impartial investigation by the responsible authorities,” conclude four physicists.
The study is the work of Stephen Jones, former professor of physics at Brigham Young University, Robert Korol, emeritus professor of civil engineering at McMaster University in Ontario, Canada, Anthony Jambotti (Szamboti), mechanic, structural engineer with over 25 years of structural design experience and work in the aerospace and communications industries, and Ted Walter, director of strategy and development for the nonprofit Architects and Engineers for the 9/11 Truth, which today represents over 2,500 architects and engineers.
In August 2002, the US National Institute of Standards and Technology (NIST) began what could be a six-year investigation into three September 11 construction accidents. It was found that both the twin towers and the 47-story World Trade Center Building No. 7, which was not hit by the plane, were all destroyed by fires and intense heat. But even NIST found that three buildings were "the only known case of complete structural collapse of high-rise buildings where fires played a significant role."
“It should be reiterated that the fires never caused the complete collapse of the steel foundations of high-rise buildings either before or after September 11th,” the researchers write. "Did we see an unprecedented event prior to three separate events on September 11, 2001?"
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The report also concluded: "Given the far-reaching implications, it is morally necessary for this hypothesis to be the subject of a truly scientific and impartial investigation by the competent authorities."
The researchers also found that "the only phenomenon capable of destroying such buildings is a procedure known as controlled demolition, whereby explosives or other devices are used to intentionally destroy the structure."
They noted that "15 years after this event, an increasing number of architects, engineers and scientists find the official explanations unconvincing."
Here are some of the observations suggested by the researchers:
“Fires are generally not hot enough and not long enough in any one area to generate enough energy to heat large structural elements to the point of failure (the temperature at which structural steel loses sufficient strength and collapses depends on the safety factor used in the structure, for example, in the case of WTC 7, for example, the safety factor was generally level 3 or higher, however, in order for the steel to lose 67 percent of its strength and fail, it must be heated to a temperature of about 660 ° C);
Most multi-storey buildings have fire extinguishing systems (sprinklers) that, when triggered, further prevent the fire from releasing enough energy to heat steel to a critical state of failure;
Structural elements are protected by fire retardant materials, which are designed to prevent the temperature from reaching sufficiency during specified periods of time;
High-rise steel frames are designed for highly redundant structural systems. Thus, if a localized failure occurs, it does not lead to a disproportionate collapse of the entire structure. Throughout history, three steel-framed multi-storey buildings have been known to suffer partial collapses due to fires. None of them completely collapsed. Countless other steel-framed high-rise buildings have experienced large, prolonged fires without collapsing partially or completely. In addition, buildings are designed to withstand the ubiquitous gravity loads and accidental fires, as well as to withstand the stresses generated by other extreme events such as high winds and earthquakes.
Physicists also note that the towers were specifically designed to withstand the impact and devastation of airliner crashes.
They write: “The total collapse of WTC 7 at 5:20 pm 9/11 is remarkable because it violates all known examples of implosion: the building collapsed in a completely free fall within the first 2.25 seconds, having covered a distance of over 32 meters or eight floors. His transition from rest to free fall was sudden, taking about half a second. It fell straight down symmetrically. Its steel frame was almost completely dismembered and crumbled mostly inside the building, while most of its concrete was crushed to fine particles. Finally, the crash was rapid, occurring in less than seven seconds. Given the nature of the collapse, any research adhering to the scientific method must seriously consider the controlled drift hypothesis. Instead, NIST (as well as the Federal Emergency Management Agency,which conducted preliminary research prior to the NIST investigation) began with a pre-determined conclusion that the collapse was caused by fires."
The original research made a note: “The specifics of the fires in WTC 7 and how they caused the collapse of the building remain unknown to this day. Although all diesel in the area contains huge energy potential, the best hypothesis has only a low likelihood of such consequences occurring."
In March 2006, NIST's lead researcher, Dr. Shyam Sunder, was cited. He said, “Frankly, I don’t know. We had problems getting conclusions about building # 7."