• The three buildings collapsed nearly symmetrically, falling down into their footprints, a phenomenon associated with "controlled demolition" — and even then it's very difficult, he says. "Why would terrorists undertake straight-down collapses of WTC-7 and the Towers when 'toppling over' falls would require much less work and would do much more damage in downtown Manhattan?" Jones asks. "And where would they obtain the necessary skills and access to the buildings for a symmetrical implosion anyway? The 'symmetry data' emphasized here, along with other data, provide strong evidence for an 'inside' job."

• No steel-frame building, before or after the WTC buildings, has ever collapsed due to fire. But explosives can effectively sever steel columns, he says.

• WTC 7, which was not hit by hijacked planes, collapsed in 6.6 seconds, just .6 of a second longer than it would take an object dropped from the roof to hit the ground. "Where is the delay that must be expected due to conservation of momentum, one of the foundational laws of physics?" he asks. "That is, as upper-falling floors strike lower floors — and intact steel support columns — the fall must be significantly impeded by the impacted mass. . . . How do the upper floors fall so quickly, then, and still conserve momentum in the collapsing buildings?" The paradox, he says, "is easily resolved by the explosive demolition hypothesis, whereby explosives quickly removed lower-floor material, including steel support columns, and allow near free-fall-speed collapses." These observations were not analyzed by FEMA, NIST nor the 9/11 Commission, he says.

• With non-explosive-caused collapse there would typically be a piling up of shattering concrete. But most of the material in the towers was converted to flour-like powder while the buildings were falling, he says. "How can we understand this strange behavior, without explosives? Remarkable, amazing — and demanding scrutiny since the U.S. government-funded reports failed to analyze this phenomenon."

• Horizontal puffs of smoke, known as squibs, were observed proceeding up the side the building, a phenomenon common when pre-positioned explosives are used to demolish buildings, he says.

• Steel supports were "partly evaporated," but it would require temperatures near 5,000 degrees Fahrenheit to evaporate steel — and neither office materials nor diesel fuel can generate temperatures that hot. Fires caused by jet fuel from the hijacked planes lasted at most a few minutes, and office material fires would burn out within about 20 minutes in any given location, he says.

• Molten metal found in the debris of the World Trade Center may have been the result of a high-temperature reaction of a commonly used explosive such as thermite, he says. Buildings not felled by explosives "have insufficient directed energy to result in melting of large quantities of metal," Jones says.