I often have trouble falling asleep at night, so when I'm lying in bed I think up stories. That's where I do a lot of my thinking. I also get a lot of ideas while I'm reading - sometimes reading someone else's stories will make me think of one of my own.

All my books take a long time to research. I spend several months researching before I start writing, and in the middle of writing I often have to stop and look up stuff. At my local library, I am one of the best customers! The research takes several months.

With a book called 'Keeping Score,' I really did want to write a book about the Korean War, because I felt that it is the least understood war in the American cultural imagination. So I set out with the idea that Americans didn't know much about the Korean War and that I was going to try to fix a tiny bit of that.

You burn the paper, but not the words. You silence the words, but not the thoughts. You kill the thoughts only if you kill the man. And you will find that his thoughts rise again in the minds of others - twice as strong as before.

Each of my books has taken me a different length of time to write - eight months for Seesaw Girl, eight months for Shard, three years for When My Name Was Keoko! The publisher takes another year and a half to work on the book, so altogether each book can take up to three or four years to publish.

My son and I discovered Terry Pratchett's books together, when he was about eleven years old. He'd be reading on his own and would start to laugh, and then eagerly read the passage aloud to me--and I'd do the same to him! Pratchett's books became a shared source of delight for us back then, and they still are today.

I do think that part of literature's job is to comment on and participate in the social issues of the time.