On Fri, 21 Sep 2007 20:53:31 -0500, Harry Thomas
wrote:

The structural steel did not melt. It did warp enough to shear some
3/8" bolts holding the horizontal cantilevered members to the columns.
Once the downward motion of one floor began there was no way for the
floors beneath to hold. Classic pancake collapse. The architect's
name should be right up there with the 19 hijackers. Those buildings
were a disaster waiting to happen.

BTW, Mohammed Atta was an architect, too.