Fanfic_History to ask any historical questions-- what the Washington Post headlines were in December 1941, when the latest year the Vikings would have been raiding Scotland was, when the hoopskirt or the bustle went out of style in Europe or the US, who the Soviet Premier was in 1972, or when Notre Dame became co-ed, for example.
Fanfic_Geography to ask any geographical questions-- If your characters are in Chicago, what El stop do they need? If they're on a whirlwind trip to Paris, what hotel might they stay in?
Fanfic_Language to ask any translation questions-- If you're writing a story, and need to know how to ask the location of the bathroom in German, or Klingon, ask here. If you need a spell translated into Latin, again, this is your resource.
Fanfic_Law to ask any questions regarding the law-- when characters are arrested, arresting, on trial, or involved in investigations; for use in fanfic about lawyers, police officers, investigative agents, etc.; or as part of historical information in period pieces.
Fanfic_Med to ask any medical questions-- when characters are injured or ill, for use in fanfic about doctors, or as part of historical information in period pieces.
Fanfic_Science to ask any science questions.
Fanfic_Supernatural to ask any supernatural questions.
Prof_Fanfic for help concerning the profesional aspects of your character's lives.