Why Indeed Did the WTC Buildings Completely Collapse? By Dr. Steven E. Jones Physicist and Archaeometrist The views in this paper are the sole responsibility of the author. The paper has undergone significant modifications following an additional set of peer reviews organized by Journal of 9/11 Studies Editor Kevin Ryan. An earlier version is now published in a volume edited by David Ray Griffin and Peter Dale Scott, 9/11 And The American Empire: Intellectuals Speak Out, Northhampton, MA: Interlink Publishing, 2006. It is published here by kind permission of the editors. One of the editors (Prof. Griffin) has explained that there were four reviewers for my paper, all Ph.Dís, two were physicists. To clarify some apparent confusion: the paper is not published in "The Hidden History of 9-11-2001," Elsevier, 2006. ABSTRACT In this paper, I call for a serious investigation of the hypothesis that WTC 7 and the Twin Towers were brought down, not just by impact damage and fires, but through the use of pre-positioned cutter-charges. I consider the official FEMA, NIST, and 9-11 Commission reports that fires plus impact damage alone caused complete collapses of all three buildings. And I present evidence for the controlled-demolition hypothesis, which is suggested by the available data, and can be tested scientifically, and yet has not been analyzed in any of the reports funded by the US government.