An Australian PhD student has found a cheap way to make solar cells with nail polish, a pizza oven and an ink jet printer. 23-year-old Nicole Kuepper's invention, named iJET, doesn't require the pricey clean rooms and high-temperature ovens of traditional solar panel manufacturing plants, thus dramatically lowering the cost of solar and paving the road for introducing the technology to third-world countries.

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The Buenos Aires government would have done the late Owen Lars proud with their newly installed US$5 million Intelligent Monitoring Towers. Designed to collect information about the city's air and noise quality, we can easily see these 42 towers being at home collecting moisture on a dusty planet in a certain binary star system far, far away. The towers measure cobalt, ozone, nitrogen dioxide, methane, carbon monoxide, benzene and humidity (just like on Tatooine!).

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Furukawa, a Tokyo-based tech company, has developed a thermoelectric conversion material that's said to be able to boost the fuel efficiency of cars by 2% by converting about 7% of exhaust heat into electricity. Unlike conventional thermoelectric conversion materials, which warm up as a whole when one side is exposed to heat, this new material generates energy via the difference in temperature between its two sides. Apparently, that makes it much more efficient. They're currently working to improve the system, but they hope to have it ready for mass production by 2011, at which point that 2% will solve the petrol crisis single-handedly. Just hang in there for a few more years! [Nikkei via CrunchGear]

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Looking to save water? Say hello to the EcoJohn, a toilet that uses no water. Instead, after you do what you do, you "close the lid and a large, screw-like auger turns and carries the waste to the burn chamber where the propane burner then bakes urine, feces and paper into ashes." Wow, that's horrifying! This thing isn't even classified as a toilet. It's classified as a barbecue. If you're looking for a sure-fire way to ruin your family's summer cookout plans, I think you just found it. [OC Register via Neatorama]

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Electronics manufacturer Hoshino has just announced "the world's first biodegradable USB disk." It's constructed of the corn-based plastic polylactide, and just in case you forget that fact, they've shaped the drive like an ear of corn. We don't have a lot of information on the device, but it appears they've figured out how to make the entire drive biodegradable, not just the casing (though that cop-out is certainly a possibility). Since most of our electronics we're using right now won't be part of our daily arsenal in two to three years, it's good to see manufacturers at least considering how we'll dispose of all this junk. [Hoshino via Gearlog]

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Yes, yes...we have heard plenty of complaints about iPhone 3G battery life, and there are already several solutions like battery packs and rechargeable hip holsters hitting the market. However, the new case from Mobile Fun has one advantage over all of these other devices--it can be charged by the sun.

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I'm all for exploring new technologies that help us save gas, but I think Nissan has gone a little too far with their "Eco Pedal." This new technology calculates the most fuel efficient rate of acceleration and then fights back against the driver's foot when it feels that rate has been exceeded. Nissan claims that the system can improve fuel efficiency by as much as 10 percent, which is why they plan on implementing it into their cars next year. As asinine and unsafe as all of this sounds, at least Nissan had the good sense to implement an on / off switch. [Detroit News via Jalopnik]

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Solar bags are a great way to charge all your gadgets while out and about, but Switzerland-based bag maker Sakku one ups the green aspect by making its bags out of recycled sails. Each Sakku Buddy comes stamped with a "story" listing the name of the lake or sea which the boat that used the sail is located. Each bag has a 2.5W solar panel and is big enough to contain a 17" notebook. Currently only available in Europe, the Buddy costs either US$275 or US$385, depending on whether you get the chargeable battery option. [Sakku US page via Coolest Gadgets]

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Friend of Giz and contributing editor Brendan I. Koerner was on the Colbert Report last night to school Stephen on ways to save the environment. Koerner discussed the paper/plastic debate, using air conditioning vs. windows, and whether it's cheaper to buy CFLs or regular bulbs. Colbert let the green-concious Koerner off pretty easy, but he did manage to raise a fascinating point: If CFLs weren't meant to be licked, why do they look so damn delicious? [The Colbert Report, Brendan Koerner]

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