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A freezer was recently invented for Ben and Jerry's by researchers at Penn State called the thermoacustic freezer. It freezes with sound waves. Ben and Jerrys likes this because it is more enviromentally friendly than regular refrigeration, since regular refrigeration gives of hydrochlorofluorocarbons (HCFC's) and hydrofluorocarbons (HFC's) which are bad for the ozone layer.
http://www.nytimes.com/2004/12/12/magazine/12THERM.html?ex=1103691600&en=f85f8ccd8985a322&ei=5070
http://http://www.benjerry.com/our_company/press_center/press/thermoacoustics.html
This is pretty cool.
http://www.nytimes.com/2004/12/12/magazine/12THERM.html?ex=1103691600&en=f85f8ccd8985a322&ei=5070
http://http://www.benjerry.com/our_company/press_center/press/thermoacoustics.html
This is pretty cool.
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