Ionic cooling is a little known way of cooling PCs efficiently and silently.  The Future of Things gives you an overview of how the technology works, and an interview with 3 very knowledgeable scientists in that field, one of whom is the CTO of Kronos Advanced Technologies.
“A new type of ultra-thin, silent cooling technology for processors is being developed by Kronos Advanced Technologies in collaboration with Intel and the University of Washington. In two years, this new technology might replace existing cooling fan technology in laptops and other portable devices, making them more reliable and far quieter.”

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