At traveling around the world, yes. There was an earlier prototype, Solar Impulse 1, that broke eight records, three of them when Borschberg flew it for twenty-six hours straight in the first night flight in the history of solar aviation. They're now on to Solar Impulse 2, which has greater energy density in its 1,400 pounds of lithium-ion batteries and improved 17.5-horsepower electric motors that spin the propellers with 94 percent efficiency