I remember walking into the schoolyard, a block from the World Trade Center, and watching a tower collapse. And I remember running

'I never realized the gravity of my birthday until the first time my dad took me to New York when I was 10 years old.'

Exclusive book excerpt: A minute-by-minute investigation of how senior leaders scrambled -- and fretted -- as the U.S. diverted its planes.

I remember walking into the schoolyard, a block from the World Trade Center, and watching a tower collapse. And I remember running