They've come and gone over the years, but here are a few:
1) Dictionaries -- I used to just sit and read them, and once tried to put together a lexicon of Indo-European roots that I could use as a language. Yes, I was very young.
2) Greek mythology -- I started reading these stories in about the 3rd grade, and am still going strong with them, although now I just tell myself the stories, rather than reading them. Also Irish and Welsh Celtic mythology. Don't care for Roman or Norse myths.
3) History -- various periods at various times, including WWII, the US Civil War, McCarthyism, Medieval England, family history stories and Republic of Texas history. I drive my daughter nuts with this one. "Mom! Lay off the history lecture!"
4) Gardening -- I collect plants, books about plants, magazines about plants and gardening, plant facts, etc. My garden itself is kind of haphazard, but I like it.
5) Archaeology -- various topics including historical archaeology, the American SE Archaic and Woodland periods, Greek and Roman periods, and the use of remote sensing data and other technology in archaeology.
6) Herbalism -- all forms
7) Sci-fi online fan fiction -- this one really bugs me, because I can't seem to let it alone, even when I want to. Not the shows so much, just the fan fiction. I call it brain candy -- or crack on a bad day.
8 ) Quilting, Needlepoint and Knitting collecting -- I don't actually produce anything, just can't seem to finish a particular project, but I love to collect the patterns, fabrics, yarns and stuff. I love the feeling of doing handwork, too, but don't really care whether anything comes of it.
9) Books -- I'm an inveterate bibliophile. Whenever I'm feeling down, I hit the used bookstores. It cheers me right up. Of course, I'm now buried in books. I have whole stacks I haven't gotten around to reading yet.
10) Religious history -- doesn't matter which one. I love them all.
Patricia