Before we had Google for all of our embarrassing questions, Pinterest for craft inspiration, and Craigslist for all of the odds and ends of life, more people relied on public librarians to field all manner of questions. And the New York Public Library still has records of some pretty odd ones.
You can chuck that Merriam-Webster dictionary that's sitting on your desk out the window (along with all your magazines). It's been iPad-ized and it looks beautiful. Also, it's free.
The guys over at XKCD created this wonderful chart detailing the amount of radiation you get from just living your daily life and how it compares with the radiation dosages in scary disasters. It's comprehensive, informative and serves as a great reference point given Japan's current situation.
Yeah, sure, you probably know a lot. But there's always that movie or star constellation or post-graduate vocabulary word or Wikipedia fact that you can dig into. Here are the six best apps that'll satisfy your insatiable thirst for knowledge.