Adventurers try to trek across Australia all the time – but few attempt the journey in a wind-powered electric car. Two Germans, Dirk Gion and Stefan Simmerer, recently wrapped up an 18-day drive that took them 3,000 miles along the southern Australian coast in a vehicle that used the breeze to juice up its battery. The total electricity cost for the Wind Explorer vehicle came out to less than $15. In addition to an 8-kilowatt-hour lithium-ion battery pack, the car is equipped with a kite system and a portable wind turbine with a 20-foot bamboo mast.