none taken...but, in the "real world", they show all those buildings ripped open, and still standing, but, as i know about the WTC, at least, the building cannot stand without the body intact...the whole thing is based on trusses, that form the floor, and basically hold the outside to the core...if the trusses give, or the body is broken, the whole thing comes down...thats why the building fell, after staying up so long...the heat caused the joints to heat up, weakening them, and as soon as one floor gave, the building had enough momentum to fall the rest of the way...so sad, that the buildings fell b/c people wanted to build taller, faster, than anyone else...