9/11, 20 years later | Penn Today

This week marks the 20th anniversary of the Sept. 11, 2001 terrorist attacks on the World Trade Center and the Pentagon. Coming on the heels of the exit of U.S. troops from Afghanistan, America’s longest war and a response to the attacks, the anniversary provides an opportunity to reflect on the legacy of 9/11.

Penn Today asked experts across the University to share their thoughts on how 9/11 transformed their field or their research, the world, or their lives.

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