It is considered unusual for three large urban structures to collapse the way they did all on the same day?
According to some reports like the following...
http://vestigialconscience.com/Pullit.html
Larry Silverstein, someone associated with the WTC, was involved in the decision to 'pull' the building...
This is supposedly what he was heard saying on a PBC documentary:
'...I remember getting a call from the fire department commander telling me they were not sure they were going to be able to contain the fire...and I said, 'Well, you know, we've had such terrible loss of life...maybe the smartest thing to do is, is 'pull' it...and they made that decision to 'pull'...uh, and we watched the building collapse.' True or not true?
What exactly does 'pull' mean?