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While a senior at Georgetown, Nathaniel Ru, now 23, partnered with friends Jonathan Neman and Nicolas Jammet to develop an eco-friendly salad and frozen yogurt eatery. Ru graduated in 2007 and three months later sweetgreen opened, grossing over $1 million in its first year. Not a bad way to start a business career. (The trio plan to open a Dupont Circle location this month and Bethesda location soon).