I do a lot of revising on paper. Sometimes I think I should just write longhand - what I type reads very different once I print it out.

For me, writing for younger audiences and writing for adults uses two different halves of my brain.

I kept a journal when I was a teenager, so I definitely look back on those to see how I dealt with friends and cliques and getting picked on, or boyfriend breakups.

I know these are going to sound like school reading-list suggestions, but if you like dystopian fiction, you should check out some of the originals: 'Anthem,' by Ayn Rand; '1984,' by George Orwell; or 'Brave New World,' by Aldous Huxley.

,the rest of the girls pretended not to notice. That's just what best friends do.