9/11 brought changes to skyscrapers
from The Associated Press via Google News
A decade after 9/11, could any of the nation's 21,000 high-rises withstand an attack like those that caused New York's twin towers to collapse? Could the thousands of people inside find a way to safety? At Chicago's Willis Tower, like other skyscrapers around the country, much has changed since two hijacked jets slammed into the World Trade Center.
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