Here's a little excitement in the field of solar power. These cars look so cool, who cares if they don't run at night. Solar cars are probably not ready for the mass market (they may never be), but they're improving every year as technology finds better ways to harness the power from the sun. Each year the World Solar Challenge holds a solar car race. The competition features a field of competitors from around the world who race across the Australian Outback from Darwin to Adelaide, a distance of 3 021 km (1 877 mi). Last year's winner averaged approximately 91 km/h (56 mp/h). There are other races too, including the American Solar Challenge, the South African Solar Challenge, and the Dell-Winston School Solar Challenge.