Think of this as a story that lurks under so many other stories. For instance, this very day, the representatives of Russia, Germany, China, France, Britain, and for the first time, the United States, will be sitting down with Iran's representative in Geneva for what's billed as an historic exchange. On the table -- and in global headlines -- will be the Iranian nuclear program, a previously secret Iranian nuclear site, Iranian medium-range missile tests, sanctions of various sorts, the possibility of future attacks on that country's nuclear establishment, and so on. What won't be in the headlines, or the accompanying reams of analysis, is the approximately 15% of the world's natural gas deposits Iran controls. As it happens, for the Europeans and the Russians (and so for Washington), that's the story hidden under the Iranian imbroglio.