James Gleick

Information is crucial to our biological substance - our genetic code is information. But before 1950, it was not obvious that inheritance had anything to do with code. And it was only after the invention of the telegraph that we understood that our nerves carry messages, just like wires.

Is privacy about government security agents decrypting your e-mail and then kicking down the front door with their jackboots? Or is it about telemarketers interrupting your supper with cold calls? It depends. Mainly, of course, it depends on whether you live in a totalitarian or a free society.

Sometimes you see films, not just science fiction films, where you get the sense that if the camera were to pan just to the left or the right, all of a sudden you'd be seeing light stands and crew standing around. But with 'Blade Runner,' the beauty of it is that it felt like a real, breathing city.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.