Sgt_Kickaxe - 2:14 am on Apr 5, 2012 (gmt 0)
Improvements to freshness. [launch codename "Abacus", project codename "Freshness"] We launched an improvement to freshness late last year that was very helpful, but it cost significant machine resources. At the time we decided to roll out the change only for news-related traffic. This month we rolled it out for all queries.
Evergreen content begone? I don't see that as ensuring the best is always returned because some things don't change(and don't need updating).