What are some things you like to learn about?

At various times in my life I take up hobbies, and learn all about them. In my time, I have learned about silver plated flatware, collectables of all kinds, rocks and minerals, and how to cut and polish rocks. I have learned lithography, how to cast aluminum in a forge, and how to sculpt and cast a plaster cast from clay. I learned how to tint agates in my oven, and how to carve wood. I learned which weeds could be used as herbs, and which weeds currently not in use were edible, and I learned organic gardening. I also learned all about creating family trees and how to research one's ancestors online.

Unfortunately, none of these things were deep. I was certainly immersed in them at the time. I have gradually drifted away from each one of those things...because in the end, they are all passing fads.