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As John said in one of his comments, I've enjoyed learning little things about category theory in my free time because I've noticed that it changes how I think about things, both in real life and while I'm trying to solve problems. I'm also trying to learn more about a lot of the built-in structures in Haskell, and I feel even an informal class would be extremely beneficial.
I currently work full time and go to school full time online at Arizona State University (Information Technology). I work full time at Baxter Healthcare servicing/evaluating our Spectrum V6/V8 IV pumps. I also have a 2 year degree in mathematics from a local community college, so I'm a bit of an enthusiast.