There are certain things that I'll hear about and that I think will make a great book and I put it in a file. Sometimes it's a situation that interests me, and I don't even realize what I'm trying to say about it until I get closer to it. Sometimes the book after that I've written 125 pages of, and I can tell you what the book is after that. I just sort of have a linear progression, but more than anything, the topics land in your lap. I don't feel that I go out searching for them.
