One of my main obsessions for years has been the pursuit of knowledge for most topics. It's great because it's lead to me getting various obsessions.
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I have noticed that when I learn about something, I want to learn more, and more about it, until the next thing comes along. I am the kind of guy who has been known to drop everything and research on off-the-wall subjects which tends to make some people mad, but I don't care, as long as I can learn more.
I am like this as well, and it drives my friends up the wall sometimes.