Hi. Can someone explain why a thread may be closed? Is this part of the rules of the forum? I just observe that many threads that I find interesting are closed, and it seems to be abrupt. Often I see this done by the same moderator... Something like a summary: "Nothing new to add". If I come to the thread after it's closed, I cannot participate or ask a question, etc. I guess I just don't understand why some threads are open for years, and others are closed.. again, - seemingly abruptly. Thanks!