I don't think there's such a thing as "reading too much". Your only problem is that you're just curious! And if that's a problem, then I have it, too :) Like you, I have this urge to research anything I read about. For example, a couple of months ago I read the book "The Testament", by John Grisham. I was so intrigued by the locales mentioned in the book, especially the "Pantanal", a wild area deep in the Amazon River of Brazil, that I logged on the Internet and search anything that it had to do with that place. I had a lot of fun and learned a whole lot about Brazil, its jungles, etc.

That's one of the reasons I love to read; it has a ripple effect. The more you read, the more you learn. Nothing wrong with that :)