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My main areas of expertise (all as an amateur, alas) are baseball history and analysis, "alternative" music from the 1970s to the present, astronomy (particularly planetary and the near stars), and history (particularly British Empire history from about 1688-1914). Since all but the last seem to be in good hands already, I've been concentrating on historical Wikarticles:
...as well as a bunch of smaller articles hanging off these.