Reply #51: Well,

[hack89]

1. Explosions do not equal explosives. It is hard to imagine the violence and forces involved with the collapse - noise would be deafening as thing collapsed or failed. Not to mention all the machinery in the towers failing.

2. Everyone makes such a deal about the speed of collapse yet no one is able to explain in technical terms why it is unusual - let me ask you: how fast did the towers collapse and how much faster than a non-demolition collapse did it take? Hint - calculate the mass and momentum of the building above the impact zone.

3. The 47 vertical core columns were not single homogeneous pieces of steel - each one was made up of hundreds of smaller beams joined end to end. As the massive weight of the building above the impact zone came crashing down, the stress overloaded all those joints and they failed. Each of those 47 beams disintegrated into its component parts.