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A visitor looks at the faces of some of the victims of the Oklahoma City bombing at the Oklahoma National Memorial museum in Oklahoma City. Joe Raedle/Getty Images

19 years after 9/11, Americans continue to fear foreign extremists and underplay the dangers of domestic terrorism

The Sept. 11 bombings killed almost 3,000 Americans. But if you exclude that unique event for the last two decades of terrorist activity, a different picture of US vulnerability appears.
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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