Unfortunately for 911 Truth deniers, there is incontrovertible proof.

Demolition waves are clearly visible, exploding before the top mass can pulverize it.
http://www.youtube.com/watch?v=Ri9Uz1Wa-Xc

WTC7 displays all the characteristics of controlled demolition, not to mention features which can only be explained by it.
http://www.youtube.com/watch?v=JFFkbo3o0NM

Scientists and Academics have written articles claiming to prove the controlled demolition theory, and have not been refuted.
http://www.journalof911studies.com/v...Demolition.pdf

Its a simple fact that government officials have tried to cover up evidence, like the molten metal.
http://video.google.com/videoplay?do...03712325092501

And I havnt seen one person in any forum discussing this topic even attempt to refute any of the facts and arguments provided by over a hundred of Architects and Engineers.
http://www.ae911truth.org/