First off: mods, you do an awesome job keeping the sub-forums as uncluttered as possible....and I love that clearly dumb new threads (ie, "is this real?") get shut down fast.... But I'm curious.... I've seen some similar topic threads merged.... and some are out right closed.... I know I don't always think to search a topic before posting...esp if the thread has fallen down past the first couple pages.... But what tips the decision between merging to closing?