It took 99 days to extinguish the fires.

Last week we marked the 25th anniversary of 9/11. My parents' generation remembers where they were when John F. Kennedy was killed. I vaguely remember the Challenger exploding on television. But for Generation X and many millennials, 9/11 is the event in American history most seared into our minds. If you are under 25, you were not alive.

The Only Plane in the Sky: An Oral History of 9/11 by Garrett M. Graff

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