You might have noticed that lots of people in San Francisco think they know all about wine. But very few can claim the title of master sommelier, as can Emily Wines (yes, that is her real last name) of Fifth Floor Restaurant and Lounge (12 Fourth St. at Mission). In fact, Wines made history last year by becoming only the second woman to pass the rigorous Master Sommelier examination and win the prestigious Remi Krug Cup. So it's lucky for wine enthusiasts that Wines on Wine, her biweekly series of classes, is under way once again. At "Wine and Cheese from Cowgirl Creamery" on Wednesday, Feb. 25, students will explore a variety of wines alongside delicious cheese pairings from a local artisan cheesemaker too. Classes cost $40 per person (half off if guests stay for dinner) or $325 per person for the entire 10-course series. The class begins at 6 p.m. Sign up by calling 348-1555. For details and the entire spring schedule, visit www.fifthfloorrestaurant.com.