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Because I am mainly active in one thread, thats why. It is an interest of mine and it has been running for over a year.
how do you observe someone so diligently as to notice such a thing?
I wouldn't worry too much about it. You can Google the members username and possibly find some tracks to follow.
What do you mean by that, how does that work?
Could be a health issue, but unless it is ultra-serious, I think they would have been back to say that that is why they are not posting at the moment. You know how you get a feel for how involved a person is in the thread. This thread is a long running one and there are a number of regular posters which we all know and over time, have got to know their personality (as far as that is possible, of course). I do not think it is a health issue - unless it is a "permanent" one !!