In other news, high-flying green vehicles charted the horizon as Pipistrel introduced the world's most powerful electric airplane and an incredible human-powered helicopter broke a world record. We also saw Ohio State unveil plans for the 400 MPH Buckeye Bullet 3 and we showcased designs for a stunning concept car with a segmented transforming skin. Autonomous vehicles were a hot topic as well -- London's Heathrow airport rolled out a set of electric personal transportation pods, and China's Hongqui unveiled a driverless car to compete with Google's vehicle (which crashed this week).
It was also a big week for wearable technology as researchers developed new breed of stick-on tattoos that can track body functions and we took a look at a sonic fabric bag made from recycled audio tapes. Finally, we got set for the start of the academic year by bringing you six of the best solar-powered bags, an innovative new breed of e-paper that doesn't require electricity, and we launched a blowout back to school contest where you could win $1155 in green school supplies -- including a photovoltaic backpack and a HP Pavilion laptop.