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November 23, 2010. Chapel Hill, NC.. Stanley Hughes, an organic farmer whose family has been in the business for generations, and his wife Linda Leach, sell sweet potatoes to Michael Roberts, a dentist at UNC, at the UNC Hospital Farmer's market..   The sweet potato seems to be having a comeback, with many farmers increasing their planting of the potato's numerous varieties, as well as many restaurants including it on their menu in various forms such as the ever popular sweet potato fry.