There seems to be a faster decay for stories related to Snowden/NSA. I guess that got "hard coded" after a little while ago the front page was almost completely

There seems to be a faster decay for stories related to Snowden/NSA. I guess that got "hard coded" after a little while ago the front page was almost completely based on NSA related stories. Therefore the stories often staying longer on the front page seems the one that do not have Snowden or NSA in its title.