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Fifteen years after the Sept. 11, 2001 terrorist attacks, friends and families still grieve. Children still search for understanding. Survivors still suffer. The nation, and the world, still remembers.

NBC News and MSNBC present a look back at the day of terror that killed nearly 3,000 people in New York, Washington, D.C., and Shanksville, Pennsylvania, examining its lasting impact at home and around the globe.

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