Lately I've had a weird fascination with 4-d shapes and entomology. Last week it was different mathematical bases and ancient cosmological models of the universe. Kind of esoteric interests, but in the past I've gotten just as deeply interested in subjects like baseball, the civil war, and really good tv shows like Freaks and Geeks and Nowhere Man.
Does anyone else find themselves cycling through random interests like that? If so, how long do your interests usually last? What are you currently obsessed with?