One of the nice things about having access to all of the collective knowledge of humanity at all times is that I'm free to indulge some of my weirder obsessions to the point of it being detrimental to my sanity.
One of my more recent interests is how things age in the natural world. The lifespan of cetaceans, for example, varies widely but is also way, way longer than you might expect; for some species of whale scientists don't have a great bead on their lifespan because some of the individuals being studied have been alive and kicking longer than the concept of studying whales has existed.