I remember the moment when I recognised that I was home. It was August 1998, about a week after I'd moved to Cambridge, Massachusetts. I was walking out of the 24-hour Star Market at University Park near MIT, at about 2am, and I overheard a passer-by saying to his companion, "So, if you could solve the containment problem, then you could put some antimatter in a ship and go places!" Though there were advantages and drawbacks to being rather trapped within an MIT-centred social network, at least I had a social network, and it was a comfortable one since I understand geeks and geeks understand me. The only factor that spurred me to leave Boston was the rise of the Bush government in the United States. Though I've been back for long visits, things have never fallen into place to give me a stable reason to move back. But whenever I crest that hill in Newton and see the Boston skyline after a long absence, I still feel that I'm coming home.