11.   All the paper swirled out into the dusk when the building fell, and by morning was dispersed all over Lower Manhattan and beyond.

12.   Buildings may fall down, but books are forever.

13.   But just as they stepped into the street, the second building fell, plunging everything into blackness.

14.   But while old buildings can fall into disrepair, new ones can be born that way.

15.   Collapse was so unthinkable that the fire departments command center was set up too close and was crushed when the building fell, killing senior officers.

16.   Engineers cautioned, though, that it will take time to determine how the buildings fell.

17.   He arrived at the scene shortly after the World Trade Center buildings fell.

18.   He was inches from a firefighter, Lt. Andrew Desperito, when the second building fell and took Desperito.

19.   He said the buildings had fallen victim to maintenance problems ranging from broken steps to cockroaches.