Lacking reports of prominent explosions, the ultimate key in the matter is the reports of the "pools of molten steel." The issue being that between the molten steel reports and the relative silence, Thermite is the next best candidate for sabotage. It is vitally important to realize that if the metal had been heated by ANY conventional fuel, it would – by the dictates of physics - have to be heated from below - ONLY! Again, jet fuel, burning in open air, will reach roughly 1,100 degrees - insufficient to actually MELT steel. Certainly it can weaken the steel, but not melt it down. The WTC jet fuel did not burn in open air, thus a lower temperature may reasonably be assumed.
We may be certain that - in the best case scenario - the jet fuel didn't find a "magical" equivalent of a burner mechanism or "Blast Furnace," BELOW the steel. Hence, a device on the order of a Thermite charge is the ONLY POSSIBLE EXPLANATION as to how the molten metal could be found at the bottom of the debris, as opposed to being melted OVER or AMONG the debris.
Anyone who has seen a military Thermite grenade melt through the block of a jeep engine - in approximately ten seconds - will attest to the melting properties of Thermite.
ONCE AGAIN – in the bizarre legacy of 9-11 - No questions were asked!
The laws of physics tell the ultimate tale. “When you eliminate the impossible, whatever remains – however improbable – must be the truth!" - Doyle
The center-section supporting structure of the buildings broke apart as it collapsed. Therefore, an argument for ‘mechanical energy transmission’ doesn’t hold up. It’s not the same as hitting a nail with a sledge-hammer. A ‘shattering’ sledge-hammer would not carry the force to strike, deform and ‘heat’ a nail. In other words, the force of the collapse couldn't/didn't melt the bases of the core columns.
The south WTC tower is most representative of the collapses. Remember that it lost it's “cap”-
- therefore the energy from the structure above would – in theory - be adequately diverted so as NOT to induce a continued - and total - vertical collapse of the remainder of the structure, below. In theory, the “cap” should have torn loose and independently fallen. However, if there had been an independent - and nearly simultaneous - collapse of the core, the collapse would continue - vertically. The “cap” tilted by approximately 22 degrees, but did not fall off; it collapsed – "in formation” - with the rest of the structure. The simultaneous "fall" of the two sections tells a story, by itself. The 'center of gravity' of the "cap" abruptly found a vertical path to the ground! The most probable reality being that the core collapsed, inducing the tilt of the "cap."
If the "cap" had tilted first, the mechanical tilt of the “cap” should have relieved a major portion of the purely vertical stress from above; alleviating any tendency for the immediate lower structure to “pancake;” as was witnessed. It is not difficult to imagine the floors collapsing over a period of time - but NOT simultaneously!
With the outer walls being vertically self-supporting, any interior dynamics (action) would be hidden from view. Remember that the shattering of the outer walls progressively followed the collapse of the building core.
It is worth noting that there was an expected delay in the core collapse, as evidenced by the videotapes and pictures illustrating heavy free-falling external debris gaining a slight lead on the building collapse.
The basic mechanics of the collapses offer another major clue - BOTH buildings were damaged so as to create a segmented "cap." Yet with a radical difference between the mass (size) of the "caps," both towers collapsed - identically!
In the extreme, the individual floor "plates" might have been able to let go (“peeling” from around the columns and the outer walls), but - as a minimum - the lower (ground level) segments of the heavy steel inner columns should have been left standing, somewhat vertically, like stray swizzle-sticks. Yet, clearly something major also happened at the very base of the building - a search warrant is required to find the strongest vertical components in the structure - but not so with the weakest!
Given that the lower columns were radically thicker steel, and obviously stronger, some of the columns should have still been standing – in some significant number. Yet, from the post-collapse photographs, the outer walls appeared to be the strongest vertical sections; which they were not. Yet, the lower outer walls were left standing; not the more massive “core” columns. The magnitude of both vertical and lateral forces - even considering location - doesn't make sense; not even in the context of 'chaos.'
It IS certain that not all of the columns collapsed at their base, evidenced just by the blessed group of survivors caught in the remains of the sole-surviving stairwell. More...
http://home.comcast.net/~skydrifter/collapse.htm