Why did the World Trade Center towers fall on Sept. 11, 2001?
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"How did the Trade Center towers fall on Sept. 11, 2001? Wendy Aibel-Weiss, Director of Exhibits and Education at the Tribute WTC Visitor Center, explains why the twin towers of the World Trade Center fell on Sept. 11, 2001.
Find out more about September 11th at: http://www.worldbook.com/content-spot...
Videos are produced and directed by Jennifer Parello for World Book Encyclopedia"
