Measurement of the collapse of Building 7 of the World Trade Center proves free-fall collapse rate. 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