To get back to the topic, I too have seen enough analysis to convince me that what visibly happened to WTC 1 & 2--aircraft collisions & intense fires resulting in structural damage causing collapse--was plenty catastrophic enough to take the buildings down. After all, we didn't have a lot of precedents to inform us what would happen when fully fuelled jetliners hit 110-story buildings (whatever their design parameters might have been) at the 90th level. Now, unfortunately, we have two.

The event that really puzzles me though is the subsequent collapse late in the day of WTC 7. That building wasn't hit by planes, although it was certainly damaged by debris from the two main towers, and subsequent fire.

Have you seen the video footage showing WTC7 going down? Take a look at http://www.wtc7.net/videos.html . It fell so straight down, it appears to be suddenly sinking into a hole.

It looks like an absolutely controlled demolition going off perfectly. I just haven't heard any more likely explanation.

The "inside job" theorists claim that WTC7 housed the control centre for the blasts that took down the main towers, then was destroyed to hide the evidence. I don't know about that, but the sudden perfectly balanced collapse of a building that had taken secondary damage...has not been satisfactorily explained.

W-O