Aside from changing my major every semester based on what classes I'm currently taking, my strangest obsession as a child would be frogs. Stuffed frogs, frog photos, frog pajamas, frog socks, frog shirts, even my bedroom was lilypad green... As I got older it turned into music, and then into Leopard Geckos. I bred hundred of leopard geckos. I had an entire room full of rack systems, I was on online communities, I knew all of their genetics, color patterns, morphs, I could tell an albino strain by it's eye color (most would have to test breed). One day my favorite gecko died, and over the course of a couple months I sold all of my geckos, supplies, rack systems, heating, everything. Currently it's cats. My spare room is now dubbed the "kitten" room (previously the "reptile" room). I take in bottle baby kittens, anywhere from 1-5 kittens at a time, and raise them until they're 14 weeks. Once they're 14 weeks I place them up for adoption with a holistic cat rescue. While volunteering with them I've gained an interest in everything cats. I know their nutritional profiles, common illnesses and treatments, etc. My own cats are fed a frankenprey model raw diet, which I did intensive research on.
Strangest interest, I can't say which one wins the title. At the time they were important they were definitely not strange to me. I'm just blessed my fiance loves me and my brain. As he says when I get stuck in a motion or hyper-focus on a topic in conversation with people... "Sweetie, your autism is showing.". My how I love that man!
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"Everyone is a genius. But if you judge a fish on its ability to climb a tree, it will live its whole life believing that it is stupid." A. Einstein