A combination of simple bio-acoustic sensors and some sophisticated machine learning makes it possible for people to use their fingers or forearms - potentially, any part of their bodies - as touchpads to control smart phones or other mobile devices. The technology, called Skinput, was developed by Chris Harrison, a third-year Ph.D. student in Carnegie Mellon University's Human-Computer Interaction Institute (HCII), along with Desney Tan and Dan Morris of Microsoft Research... 
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