Luckily I do not need to "debunk" the Popular Mechanics website or book - It has already been discredited many times.

Debunking 9/11 Debunking: An Answer to Popular Mechanics and Other Defenders of the Official Conspiracy Theory (Paperback)
by David Ray Griffin (Author)
(42 customer reviews) Read the customer reviews at Amazon.com
http://www.amazon.com/Debunking-11-M...606250&sr=8-12


Editorial Reviews

From Publishers Weekly
Starred Review. An emeritus professor of theology with no previous interest in conspiracy theories, Griffin has dedicated himself since 2003 to the "9/11 truth" movement, a group committed to "exposing the falsity of the official theory about 9/11," and this book is a thorough, highly detailed attempt to do just that. As Griffin aptly notes, "the assumption that conspiracy theories are inherently irrational" has recently taken root in American culture, making any attack on the official government record instantly dismissible, but Griffin takes to the difficult task with solid reasoning and true zeal. All but the most dogmatic readers will find Griffin's evidence-from the inconsistencies between NORAD tapes and the 9/11 Commission Report to rigorous exploration into the physics of the collapse-detailed and deeply unnerving. For instance, Griffin considers the fact that firefighters were told, five hours before the fact, that building WTC 7 was going to collapse, despite "the fact that WTC 7 was not hit by a plane, that the available photographs show no large fires, and that fire had never caused a steel-frame high-rise to collapse." Another chilling passage looks at the Pennsylvania crash site of United Airlines Flight 93 through the testimony of those first to arrive, who were unanimous in finding "no recognizable plane parts, no body parts." For anyone who doubts the government's truthfulness regarding the WTC terrorist attack, this well-researched volume will give you a trough full of ideas to chew on.
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John V. Whitbeck, author of The World According to Whitbeck
After reading David Ray Griffin's previous books on the subject, I was over 90% convinced that 9/11 was an inside job. Now, after reading Debunking 9/11 Debunking, I am, I regret to say, 100% convinced.

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About the Author
David Ray Griffin is professor of philosophy of religion and theology, emeritus, at Claremont School of Theology and Claremont Graduate University in Claremont, California, where he remains a co-director of the Center for Process Studies. His 30 books include The New Pearl Harbor: Disturbing Questions about the Bush Administration and 9/11 (2004), The 9/11 Commission Report: Omissions and Distortions (2005), 9/11 and American Empire (2006, with Peter Dale Scott).