== Tidy up == 

 At present, this article is a bit of a mess. It seems to have a "kitchen sink" approach, filling every section with all manner of external links, uncited quotations, non-sequitur factoids, and "wouldn't it be cool if?" sentences, with no coherent structure or explanatory aim. (Indeed, when I first read it I couldn't even get an idea of what NFC is, just what it could be used for.) I've tried to remedy this at the beginning (in the lead and in the "Uses" section), where I think clarity is most important. A similar approach is needed in much of the rest of the article, if anyone else is up for it...