This has not been mentioned yet and probably the most compelling evidence they were brought down by controlled demolition:
Scientific Analysis Proves Towers Brought Down By Incendiaries
http://www.prisonplanet.com/articles...icanalysis.htm
Scientific analysis on WTC steel debris undertaken by BYU Professor Steven Jones proves that the twin towers were demolished by means of incendiary devices and the release of the conclusive evidence is imminent.
The material that was first brought into question on the back of photos and video clips of the twin towers showing a dripping molten substance and floating white ash can now be confirmed as being thermate, combining thermite which is used as an incendiary device to bring down structures and sulfur, which cuts through steel quicker and leaves a yellow residue.
Pools of molten yellow metal were also found underneath both towers and Building 7 subsequent to the collapses.
"The evidence points directly to controlled demolition which means an inside job brought these World Trade Center buildings down," Jones told radio host Alex Jones in a video interview.
Jones says that, "using advanced techniques we're finding out what's in these samples - we're finding iron, sulphur, potassium and manganese - these are characteristic of a variation of thermite which is used to cut through steel very rapidly, it's called thermate."
"In order to have thermite in these buildings in this way, to help bring the buildings down, that means that thermite had to be planted in the buildings which of course implies directly and inside job - someone had to have access into the buildings," said Jones.