Stephen Rogers has put together the ultimate guide to conlangs, or made-up languages, from Klingon and Elvish to Lojban and Esperanto. In his new book A Dictionary of Made-Up Languages, you can learn about Na'vi pronunciation and the word games that mathematicians play. It's the perfect book for word geeks, as well as anybody who loves language and linguistics. We've got an excerpt from the introduction, below.

You can pick up a copy of the book via Amazon or your favorite local bookstore.