My special interests change from month to month, but there are some regular topics.
Cats. This is a low-level, constant interest.
TV shows. I will watch every episode of every season of a TV show, as a month-long continuous marathon. Sometimes, I repeat from the beginning two or three times.
Math or science. Generally, I pick one topic and study it.
Computers. I work on a program or programming language constantly.
Work (overlaps with computers). Sometimes, I really get focused on my current project.
Web surfing, Facebook games, WrongPlanet
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"Like lonely ghosts, at a roadside cross, we stay, because we don't know where else to go." -- Orenda Fink