The URLs are different. In addition, HN intentionally allows duplicates after a certain time period -- I think it's 30 days. The idea is that the same informa

The URLs are different. In addition, HN intentionally allows duplicates after a certain time period -- I think it's 30 days. The idea is that the same information can become interesting and relevant again, either because of new circumstances [0], or to a new audience, or to an audience for which it has fallen out of memory. (I leave it to the reader to determine whether this article has passed the "interesting and relevant again" threshold.) [0] the best example I can think of: some of the things aaronsw posted to HN prior to his suicide became front page HN submissions just after. New information changed our perspective on his writings.