Fish keeping (water quality, breeding, testing, plants, etc)
Collecting expensive, natural fiber, OOAK yarn
Crocheting
Baking
Taking things apart with my son
Psychology
AS
Dogs [cats are too stupid] (foods, training, allergies/intolerances, diets, raw feeding, etc)
Momentary obsession with hunting squirrel which was brought on by-
Veggie gardening
Conscientious parenting, child education, early child experience
My past, my neurosis/talents
Thyroid disease/Health and Wellness/Diet
How to live in the most conscientious way/Buddhism
StarTrek
Twin Peaks (Special Agent Dale Cooper is my hero)
Mercedes Lackey, Valdemar Series
Elizabeth Haydon, Rhapsody Series
Dave Matthews Band
Harmony
I did not really have any childhood obsessions other than "Why do I hurt so much?" and "How can I make it stop?" Otherwise I do not recall. I know I picked a lot of grass, dug a lot of holes and stole a bunch of lunch box pudding, all of which got me in gobs of trouble. I liked lining things up, connecting things together with string and ribbons, and squishing myself into small places, hiding. Oh and asking lots of questions about everything.
"What's that?"
As my stepmom snapped it under my nose, "Smelling salt."
"Dad, how big is a gram?"
"About the size of a raisin."
/Sigh
And as a young adult,
Ethics,
Other peoples personal issues,
Chemistry
How to stay cool in the heat
Everquest (Cause I'm oldschool awesome)
And how to perfectly manage my meager income. (<$10k/year)