Here's some questions need answering:
• Why did more than 100 FDNY first responders describe, in great detail, the sounds of explosions and flashes of light that they saw and heard at the onset, and during, the collapse? Why did we not know about these 10,000 pages of FDNY "oral history" evidence until August, 2005 – and only then after a court order for their release? FDNY's own Chief of Safety, Albert Turi, and FDNY's nationally recognized Chief, Ray Downey, the "premiere collapse expert in the country" according to a fellow chief, both spoke of the presence of explosives in the Towers prior to their failures. More than 100 testimonies referring to multiple, violent explosions were ignored by the 9/11 Commission, NIST and FEMA.
• What was the energy source, and through what mechanism was it applied, that pulverized 400,000 cubic yards of concrete into a fine powder that blanketed Manhattan? Calculations show that the energy requirement for this was greater than the available gravitational potential energy of the structures. Is this the same energy source that is responsible for the complete obliteration of more than 1,100 human bodies that were never found?
• How were massive structural steel members hurled from the Twin Towers at 70 mph – some of them landing 600 feet away?
• Why were most windows within 400 feet of each tower blown out?
• Why were virtually no floors found at the base of either Twin Tower? There were originally 110 floors – each of them one acre in size. What explains the disappearance of 220 acres of four-inch thick concrete and steel decking?
• Why were there explosive ejections of dust & gases (squibs) 20, 40 and 60 stories below the rapidly descending "collapse" in each tower? These can be seen in many publicly available videos and show rapidly ejecting pulverized building materials – over 200 feet a second.
• How did the elevated building mass destroy 80,000 tons of structural steel at near free-fall speed , and with such radial symmetry? Given the asymmetrical structural and fire damage and the tendency of any disorder to grow over time (as described by the Second Law of Thermodynamics), the falling building sections should have "rolled off" of the intact sections below, resulting in only partial collapses.
• Given that open-air jet fuel fires and normal office fires both burn at a maximum of around 1,500° F., and the melting point of steel is around 2,700° F., what thermal energy source produced the tons of molten metal observed flowing out of the South Tower shortly before its collapse – and also seen for weeks after 9/11/01 in the basements of the Twin Towers and Building 7 by numerous witnesses, including the WTC structural engineer, Leslie Robertson.
• What explains the chemical evidence of thermite , an incendiary material found on the ends of steel beams? In Appendix C of its BPAT Report, FEMA documented that "evidence of a severe high temperature corrosion attack on the steel, including oxidation and sulfidation with subsequent intergranular melting, was readily visible in the near-surface microstructure." This is clearly not a feature of gravitational collapse, or jet fuel or office fires.
• What is the source of the billions of microspheres consisting of previously molten iron in all the pulverized concrete of the World Trade Center? The United States Geological Survey, in its "Particle Atlas of World Trade Center Dust Report," and RJ Lee Group, Inc., in its December 2003 WTC Dust Signature Report: Composition and Morphology, both document these once-molten drops of metal without explanation. These microspheres also contain the chemical signature of thermite, an incendiary material used to cut through steel like a hot knife through butter.
• Why did Building 7 start its sudden and uniform collapse at an acceleration rate nearly that of a body in free fall? Video analysis shows the upper portion of the structure accelerating at the maximum rate gravity allows. This can only mean that the structure below offered no resistance. What mechanism can account for the simultaneous failure of the critical number and distribution of columns required to produce this rate of acceleration? NIST now attributes the catastrophic collapse of Building 7 to "normal office fires," with little to no contribution from falling debris or diesel fuel. At this suggestion by NIST, are we to suddenly accept that our understanding of fire science, materials and structural behavior has been deeply flawed? The American Institute of Architects has steadfastly resisted changes to the building codes after 9/11!
And once more: So, where does the burden of proof lie in this case?