I'd say that a lot of my reading definitely is "chase" reading. Mostly on Wikipedia, where it's easy to pursue different concept until I get an answer. For example, I'll be wondering, "Wait, what is bread made of, anyway? Like, molecularly?" which will lead me on a chase through bread, flour, wheat, germ, carbohydrate, cellulose, et cetera. Lots of times looking it up myself is the only way to get the answer I want, because the people I'm talking to don't understand the kind of answer I want, one of real understanding.