The science of why it had to be controlled demolition, in laymen's terms, page 1

1. Sudden Onset: steel, when heated, does not suddenly buckle or break, it melts and sags. The buildings were perfectly motionless up to the moment they began their collapse.

We are only dealing with a portion of the steel, not the entire structure. The weakest point would have been the bolts used to bolt the structure together (yes, bolts were used - which is contrary to what the original designers wanted to do). Bolts leading to the internal support columns would have been the farthest away from adequate heat dissipation (which might have been present along the exterior mesh). These bolts, made of lower quality steel than the beams, themselves, would have been heated, and eventually begin to 'sag' - imperceptibly to the human eye. The amount of force being exerted on them by the structure would have made for a sudden 'snapping' of the bolts once they could no longer support the structure. The bolts would have been sheared, completely - possibly even fragmented due to the sudden release.

2. Straight Down: they didn't topple towards the damage, they took the path of most resistance, symetrically down.

Well, if the internal support is what gave... and you have an exterior mesh network that is independent of the center column.... this would force the structure to fall inwards, upon itself, and 'rip' its support mesh and support columns down with it as it falls - spare the section directly above the internal collapse, which would fall as a complete, intact unit until it impacted the ground.

3. Almost Free-Fall Speed: Buildings brought down by controlled demolition collapse at almost free-fall speed because when the upper floors come down, they encounter no resistance.

It was free-fall speed? How can you tell how fast each floor is falling, where its mass ends, and where it begins? Remember, the mass is growing as the floor moves downwards. While this has no relevance to the force of gravity - it does have something to do with where the mass comes to a rest.... which determines when it came to a rest.

Also, if sections of floors decide to collapse out of sequence with the above floors, this has an effect on what resistance is encountered. This is likely in the more terminal phases of the collapse.

4. Total Collapse: acording to the pancake theory, the horizontal steel supports broke free from the vertical columns. But if that is what had happened, the 47 core columns would have still been standing.

That would be true if the core columns were contiguous. They were not. They were bolted to the floor they were supporting.... so it collapsed in sections, occasionally being snapped by the somewhat turbulent forces it was experiencing during the collapse.

5.. Dust Clouds: Yet another common feature of controlled demolitions is the production of pyroclasic style dust clouds.

This is also a common feature of drywall and spray-on fireproofing.

6. Pulverization of Concrete: The only energy available shuld have been the gravitational energy. This is no where near the amount of energy needed to turn the concrete and virtually all the non-metallic contents of the buildings into tiny particles of dust.

At such scales, it becomes difficult for one's mind to comprehend the types of forces involved. For instance, if one floor fell flat upon another floor, it would hit with over ten times as much force as its own weight. Add into that the vibrations that would be resonating through the structure due to snapping steel and smashing floors.... you've essentially got one seriously over-sized "ultrasonic toothbrush" that will "remove plaque (concrete and anything else in contact with it)" like nothing else.

A lot of the dust you saw was drywall and spray-on fireproofing. Some was concrete, but the majority was your standard drywall (sheetrock) and spray-on fireproofing.

7. Horizontal Ejections: But gravitational energy is, of course, vertical, so it cannot even begin to explain these horizontal ejections.

Unless you count the force of snapping steel. Most of the ejections were steel supports and glass. The glass can be explained by the blasts of air caused not only by the collapse, but the environment control system in the towers (AC and heating - lots of air at different densities than the outside air and in a large column... pressure).

8. Demolition Rings: Common feature of collapses induced by explosions are demolition rings, in which series of small explosions run symetrically and rapidly around a building. This feature was clearly manifested by the collapses of the towers

.... That's physics? Please show me where this manifested itself.

9. Sounds Produced by Explosions: there is abundant testimony to the existence of such sounds before and during the collapses of the towers.

Have you ever heard what it sounds like when five or more one and three-quarter inch bolts snap under the weight of several hundred tons? Have you ever heard what it sounds like when a steel I-beam the width of your own body snaps under similar pressure?

I assure you - it will sound like a bomb, and it wills care the bejesus out of you.

10. Molten Steel: Shown in various video tesimony, and reported by several reliable witnesses.

Somehow... saying "from reliable witnesses" seems to discredit the whole thing, from the beginning.

Either way - bombs don't melt steel. Fire does, heat of compression does, and some special ordinances shoot a supersonic stream of molten copper, which can punch through an inch of steel armor plating.... but otherwise - a bomb is simply there to generate a percussive force.

I hope that clears everything up. I am about out of post length, here.