Skinput - a new input concept uses pico-projected and your bodyCarnegie Mellon University and Microsoft are working together on touchscreens for your body, called Skinput. The idea is to combine pico-projectors that project on your skin with special armband containing piezoelectric cantilevers - sensors that can measure pressure, acceleration and force - which know which part of your body was pressed based on the sound it made (on the skin, muscle or skeleton). 
This is all rather weird and cool - it can be used for gaming, or text inputting for your mobile phone. Check out this interesting video:
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