I wrote this story in 1979, when the whole Fermi question was a hot topic and we’d come to realize that the O’Neill colony ideas of that era implied that people might well live in space indefinitely. I just put the two together.

Several years ago my wife gave me good writing advice—stop trying so hard to outguess editors and write something you’d enjoy reading, whether or not you think it can sell.

The ending gave me fits for ages and I still don’t know if I’m entirely pleased with it, but I think it ends honestly and seems to work for most people. I’m at peace with it, anyway.

The internet and social media have had a huge impact in establishing a global perspective; no matter how much a country might try to control these media, it’s never going to work—the people will tweet.

I had actually read some article once in a magazine that said women responded more to men who had symmetrical faces, which just seemed bizarre and awfully hard to track.

When I was a kid, my grandparents and doctors made me drink a lot of “bitter soup” whenever I got sick, so that part required no research at all. But to write this story, I had to study some of the theories behind the bitter soups.

I figure if you can’t say what drives people absolutely crazy about your point-of-view character, you probably haven’t nailed their voice yet.