What is the one interest/hobby/job you could talk about for hours?

ludorock
Let me hear it! I love learning about people, learning new things, and hearing about their passions. I just had a friend talk to me about city planning and design for two hours and I still have more questions. I love listening to my friends just go off about what they love doing, and all the fine nuances and details that most people don't know, so I want to invite you all to do that!

What's the one hobby, interest, area of expertise or job that you love above all else, and what about it do you love best? What have you always wanted to say/talk about? Share it here! I want to know!
What is the one interest/hobby/job you could talk about for hours?
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