wordsEver tried learning a foreign language? Have you noticed how the books you could read were often boring? And were the books you wanted to read just that bit too hard to understand? Did you wish for a quick translation of a complex passage? Or want the precise meaning of the word from the spread of twenty that dictionary entry offers? With paper books, you're pretty much stuck. But e-books---with the right combination of software and open formats---may soon prove to be just the solution to keep you reading and learning in the new language. The language-learning market is attracting billions of...