MSD

The thing that makes the WTC collapse so unbelievable is that we'd never seen a building that big fall before. When the shear force on metal passes a certain point it remains solid but behaves like a liquid.

The website you linked to is so poorly designed that I'm not even sure what they're trying to say on some pages, but if it's trying to convince me that energy weapons were used on the WTC, it failed miserably. The glass and concrete were pulverized and became the dust cloud that covered Manhattan after the collapse. The steel is visible in ground zero photos. Most of it collapsed and compacted into the "bathtub" foundation. The outer cage ended up partially in the crater and partially sprawled out across nearby streets and buildings. The fact is that buildings wouldn't be of much use to us if they weren't mostly empty space. Sure, there might be 20 miles' worth of columns in the core, but let's say for the sake of argument that they're at most 10% steel. The concrete turned to dust and the rebar was crushed into the pile that went from several stories below ground level up to several stories above the ground. In [url=http://en.wikipedia.org/wiki/Image:WTCgroundzero.jpg]this[/img] picture, you can see part of the shell that is still upright, 15-20 stories high above the rubble pile using a nearby building approximately the same distance from the camera as a reference point.

The spire fell straight toward the camera, which was having difficulty autofocusing because of the dust and smoke in the air and because of the rapid fall of the spire.