Martin Belk is a charming, well-spoken 46-year-old American writer, educator and activist whose manners, clothes and North Carolina accent are frankly impeccable. But boy can he talk. Ten minutes ago I asked him a question. Not a particularly insightful question. Really just a conversation opener. Why, I asked him as we sat down in Glasgow's Tron cafe, had he chosen to move from New York to, of all places, Edinburgh a decade ago? Actually, that was now 12 minutes ago. He's still telling me.