What do you want to do when you've finished? http://jillianreilly.com/intro-to-essay/ dick oil open source software essay period runs While Musk’s Hyperloop vacuum-train idea revealed earlier this week might solve travel problems between high-traffic cities located less than 900 miles apart, the entrepreneur says supersonic air travel will be “much faster and cheaper” for longer distances, knocking several hours from thousand-mile trips and making long-haul business travel more feasible than ever before.