This has been discussed many times: http://www.hnsearch.com/search#request/all&q=%22Unknown+or+expired+link%22 http://www.hnsearch.com/search#request/all&q=%22U

This has been discussed many times: http://www.hnsearch.com/search#request/all&q=%22Unknown+or+expired+link%22 http://www.hnsearch.com/search#request/all&q=%22Unknown+... Its due to the architecture of the listing pages, the more link is a closure on the server so that the order is preserved when clicking through the pages. It prevents you from missing an item that say jumps from page 2 to 1 as you navigate from page 1 to 2. There will be a far better explanation from someone more educated in arc (the dialect of lisp HN is built in) and the general architecture of the site than me somewhere in the search results link above.