After watching the video in the post below,

[screembloodymurder]

http://www.democraticunderground.com/discuss/duboard.php?az=show_mesg&forum=125&topic_id=113041&mesg_id=113041

What struck me was this:
1) The key to the towers structural integrity was the central core which was 60 feet from the building envelope.
2) The outside walls would likely collapse inward with the collapse of the central core and the resulting floor collapse.
3) The core steel could have been accessed through the elevator shafts and stair towers.
4) The demolition charges could have been set during routine, random elevator/stair tower shutdowns during off hours.
5) The explosives could have been set without disrupting the daily schedule.
6) The explosions would have been confined to the core, far from the building envelope and therefore not obvious from outside.

I've read that a demolition study of the towers was done early on as part of the design. Does anyone know if that study is available?

[petgoat]

1. Good points.

I'd add that NIST says they have seen no evidence of explosives planted
before September 11, 2001, which I suppose leaves open the possibility
that they've seen evidence of explosives planted after 12:01 a.m on
September 11, 2001.

[screembloodymurder]

2. They weren't given any evidence.

Did the police photograph the Israeli cleaning crew caught celebrating the collapse on 911? Were WTC survivors ever given the opportunity to identify those guys?

[petgoat]

3. They could have interviewed the firemen who testified to

explosions. The TV news reports refer to secondary devices.
William Rodriguez tells about explosions. They didn't
test the steel samples for explosive residue. And they
pretended that the FEMA Appendix C samples didn't exist.

My point was I don't understand how they can distinguish
between explosives planted before 9/11/01 and explosives
planted after 12:01 a.m. on 9/11/01.

[screembloodymurder]

4. Good point.

Did they check the bolts?