I would pay to do what I do if I had to.

Once I discovered the endless fascination of doing the research and of doing the writing, I knew I had found what I wanted to do in my life. Every book is a new journey. I never felt I was an expert on a subject as I embarked on a project.

My shorthand answer is that I try to write the kind of book that I would like to read. If I can make it clear and interesting and compelling to me, then I hope maybe it will be for the reader.

People often ask me if I'm working on a book. That's not how I feel. I feel like I work in a book. It's like putting myself under a spell. And this spell, if you will, is so real to me that if I have to leave my work for a few days, I have to work myself back into the spell when I come back. It's almost like hypnosis.

My strong feeling is that we must learn more about how we learn. I'm convinced that we learn by struggling to find the solution to a problem on our own with some guidance, but getting in and getting our hands dirty and working it.

I think it's best to pick a biographical subject who lives to a ripe old age. Older people tend to relax and speak their minds. They're dropping some of the masks that they've been wearing. There's a candor.

People are so helpful. People will stop what they're doing to show you something, to walk with you through a section of the town, or explain how a suspension bridge really works.