Cripes. I'm not sure, either, so I had to go and look and - far too long later - I'm still not entirely convinced as to its origins so I've given up on it for now -- otherwise I won't get to read the rest of this article. Let alone write 100 comments on it. Or 100 comments on 100 stories. Or maybe it's 100 replies on 100 comments. It's all very confusing. **big sigh in here**