Articles on 9/11 15th Anniversary

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Collective trauma: A boy walks among some of the 3,000 flags placed in memory of the lives lost in the September 11, 2001 terrorist attacks. Jim Young/Reuters

How the pain of 9/11 still stays with a generation

Even indirect exposure to the terrorist attacks of September 11 has left profound and deep impact on those too young to remember a world before that.
The new One World Trade Center building, made with high-performance concrete. John D. Morris

How building design changed after 9/11

Tragedies involving building collapses prompt structural engineers to figure out what happened, and how to prevent it from recurring.

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