It's easier than thinking.....
http://www.thefrown.com/frowners/becomerepublican.swf
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Here's what happens to steel framed buildings exposed
to raging infernos for hours on end.
http://davesweb.cnchost.com/nwsltr69c.html
On 9-11-01, WTC7, a 47 story steel framed building, which
had only small, random fires, dropped in perfect symmetry
at near free fall speed as in a perfectly executed controlled
demolition.
http://911research.wtc7.net/talks/wtc/videos.html
http://www.physics.byu.edu/research/energy/htm7.html
http://wtc7.net/articles/FEMA/WTC_ch5.htm