Exactly......why did it take them 7 YEARS to explain the building collapses?
That is because they had to figure out how to re-write physics.
Even a Physicist that worked for NASA for almost 30yrs said:... "seeing the huge pyroclastic cloud of pulverized concrete dust and the massive structural members being hurled horizontally leaves no doubt in my mind the World Trade Center buildings were brought down by explosives."
dont you think if they were going to wire a building with explosives they would have at least have an excuse in place already as to how it collapsed? sorry to inject logic into the conversations again.
The final OCT theatre of collapse analysis actually provides an estimate of how much high explosives would be required, and a statement identifying a concrete core. The notion of collapse is illogically supported by assuming the explosives could not be planted.
Note, this is the 3rd revision and has been removed from the civil.northwestern.edu website.
Collapse of World Trade Center Towers:
What Did and Did Not Cause It?
Zdenek P. Bazant 6/21/07
1, Hon.M. ASCE, Jia-Liang Le
2, Frank R. Greening
3, and David B. Benson
4, Abstract: Previous analysis of progressive collapse showed that gravity alone suffices to explain the overall collapse of the World Trade Center towers. However, it has not been checked whether the allegations of controlled demolition by planted explosives have any scientific merit. The present analysis proves that they do not. The video record available for the first few seconds of collapse agrees with the motion history calculated from the differential equation of progressive collapse but disproves the free fall hypothesis (on which the aforementioned allegations rest). Although, due to absence of experimental crushing data for the lightweight concrete used, the theory of comminution cannot predict the size range of pulverized concrete particles, it is shown that the observed size range (0.01 mm 0.1 mm) is fully consistent with this theory and is achievable by collapse driven gravity alone, and that only about 7% of the total gravitational energy converted to kinetic energy of impacts would have sufficed to pulverize all the concrete slabs and core walls (while at least 158 tons of TNT per tower, installed into many small holes drilled into each concrete floor slab and core wall, would have been needed to produce the same degree of pulverization). The exit speed of air ejected from the building by the crushing front of gravitational collapse must have attained, near the ground, 465 mph (208 m/s) on the average, and fluctuations must have reached the speed of sound. This explains loud booms and wide spreading of pulverized concrete and glass fragments, and shows that the lower margin of dust cloud could not have coincided with the crushing front. The resisting upward forces due to pulverization and air ejection, neglected in previous studies, are found to be negligible during the first few seconds of collapse but not insignificant near the end of crush-down (these forces extended the crush-down duration by about 4%; they augmented, by about 25%, the resisting force due to column buckling at the end of crush-down, and doubled that force at the beginning of crush-up). The calculated crush down duration is found to match a logical interpretation of seismic record, while the free fall duration is found to be in conflict.
Zdenek P. Bazant et. al, 6/21/07 revision
http://algoxy.com/psych/images2/00 WTC Collapse - Wha#558C6.pdf
Clearly, if Bazant of the OCT coverup scam, revises 3 times, finally including an estimate of the equivialnt amount of explosives needed as well as a comprehensive structural description, then the revision is REMOVED, then a NASA scientist says there were explosives, there were very likely explosives used.
Concrete can be easily fractured to fall freely by a small amount of properly placed explosives, steel cannot.