I am sorry, Mr. Firth, but your girder argument fails to convince. Firefighters reported the fires were virtually out. They only needed a couple more hoses to complete the job, and then the buildings began falling. How could fires melt steel but not firefighters?

And who changed Newton's laws of physics to stop the top of WTC 2 from continuing over in its sideways fall?

http://beyondpoliticsand911.com/photogallery/albums/userpics/10001/WTC_2_collapse_2.jpg

http://911research.wtc7.net/reviews/mackey/docs/wtc2_tilt_plannorth.png

There is also the matter of the BBC reporting on the fall of WTC7 a half hour before it collapsed:

http://2.bp.blogspot.com/_7Bqr1I5gzyk/S9MZ0BDA2MI/AAAAAAAAEYA/DSJS-XXSGac/s400/a352361_po-1.jpg

It seems you never heard a government lie you didn't like.