Finally, I will add that not all duplicates are removed. On the day an article is published, if several hours (four or more) have passed since the article had last been posted, we will tend to leave it up if it is reposted (unless it is still visibile in a sidebar) to make it so that people who don't scroll back several pages will not miss an article of current relevancy. However, this should not be overdone or abused or this may change.