You've seen the films, you've read the popular science stories. It's time to ask: when will you have your invisibility cloak? Hold your horses. It's looking like a great many things inspired by cloaking science will come to pass before then. Behind most cloaking ideas is the use of metamaterials - materials whose properties are purposefully designed, defined not by chemistry but by the materials' size, shape and structure. They are already starting to crop up in consumer technology, and could find widespread use in applications ranging from computers to concert halls. Read the full story at the BBC.