Yes, seriously, I do find that very interesting. The question came to my mind as I was researching my family tree. I find it amazing the many different people required for my existance, and each of their life stories, I can discover are always very fascinating.
well, though I cannot prove the following, it does seem plausible from my study of human history, so factor this in: most people, even today in an age in which mechanized transport is widely available, spend their entire lives within thirty miles of where they were born.