The wave of horizontal mass ejection moving down the face of the North Tower of the World Trade Center is shown to move faster than heavy debris falling through air nearby. See http://www.911speakout.org for more.
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David Chandler is a member of Architects and Engineers for 9/11 Truth.
Also see my interview from December 13, 2008 with David Chandler here: Visibility 9-11 Welcomes Physicist David Chandler, ae911truth.org