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Fireproof Carbon Foam from Pyrolysed Bread
Ultrasonic has been shown to have no effect on mosquitos as a repellant:http://www.mosquito.org/faq#ultrasonichttp://www.bbc.com/news/magazine-20669080
I agree that the project is cool. Could be fun for messing with dogs (dog whistle) or making an annoy-a-tron for kids (kid whistle).
Pandora's Box - An Internet Radio player made with a Raspberry Pi!
How To Build A Solar Panel
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