Beginning this morning, Minnesota Public Radio news inaugurates a new series: "The Enthusiasts". In it we'll meet people who take their interests and hobbies to a higher level. Today we'll chat with Jan Elftman, known to many as 'The Cork Truck Lady". Jan is considered the doyen of the Twin Cities art car scene. She covered the exterior of her Mazda truck with thousands of old wine corks. Dozens of Minnesotans have used everything from paint to bones and bowling balls to turn their wheels into rolling works of art. Minnesota Public Radio's Euan Kerr caught up with Elftman as she prepared to make her next art car.