Ask Dr. Vinny--Here at Wine Spectator, we get questions from readers about all aspects of wine, from the down and dirty of wine production to the finer points of white tablecloth dining. Since 2005, we've turned to our witty and tireless correspondent Dr. Vinny to find the answers to your toughest queries. Here, Dr. Vinny fills us in on Champagne and sparkling wine. Do you have a question for our masked wine columnist? If so, go to www.winespectator.com/drvinny.