world's fastest plug-in hybrid and an insane screwdriver-powered tricycle that sends you flying through the streets headfirst. The field of alternative fuels also advanced by leaps and bounds as the U.S. Department of Energy announced a new breed of cost-effective biofuel and a team of researchers discovered a way to efficiently produce hydrogen from urine.
From flying houses held up by balloons to skyscrapers that harvest energy from bolts of lightning, this week we also showcased some of the world's most incredible buildings. We were wowed by the futuristic finalists of the eVolo skyscraper competition, which included underwater spires made from plastic debris and massive megaprojects that contain entire cities.
This week we also spotted several exciting new examples of green consumer tech - from a clever brain-shaped CFL bulb to ASUS' new line of cardboard computers to a wearable mix tape you can pin on your sleeve. We also celebrated the launch of Apple's latest tablet by rounding up 14 of the best eco-friendly iPad cases, sleeves and bags. Finally, we kicked off a contest where you can win a beautiful recycled leather iPad case from Dewdrop Designs, and we shared 11 chic travel essentials for jet-setters on the go.