http://www.thebulletin.org/content/media-center/announcements/2012/01/10/doomsday-clock-moves-1-minute-closer-to-midnight http://www.thebulletin.org/content/media-center/announcements/2012/01/10/doomsday-clock-moves-to-five-minutes-to-midnight http://www.thebulletin.org/content/doomsday-clock/timeline