My interests tend to tie into each other, or at least I can make it that way. My longest obsession is books - collecting them and reading them. I go through obsessions on a short term basis too though, but I can usually add them into the book collecting/reading and make them fit that way (e.g. folklore, mythology, Harry Potter - all of which are semi-long term, death, the paranormal, WW2 ect).
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178/200 - Asperger's Quiz
39 - AQ
9 - EQ, 104 - SQ (extreme Systemiser)