I don't think people are karma farming here. They're just too new and/or don't recall when certain posts have been on HN before. Dang has a pretty good list of

I don't think people are karma farming here. They're just too new and/or don't recall when certain posts have been on HN before. Dang has a pretty good list of links that keep showing up every 90-180 days on a continual basis (e.g. "The Story of Mel")