I’d never fully realized this: 9/11 was for America’s kids exactly what Nov. 22, 1963, was for their parents and uncles and aunts. They were at school. Suddenly there were rumors in the hall and teachers speaking in hushed tones. You passed an open classroom and saw a teacher sobbing. Then the principal came on the public-address system and said something very bad had happened. Shocked parents began to pick kids up. Everyone went home and watched TV all day, and the next…

Nine-eleven, he felt, changed everything for his generation. “It completely destroyed our sense of invincibility—maybe that’s not the right word. I would say it made everything real to a 12-year-old. It showed the world could be a dangerous place when for my generation that was never the case. My generation had no Soviet Union, no war against fascism, we never had any threats. I was born when the Berlin Wall came down. It destroyed the sense of carefree innocence that we had.”