"...researchers at MIT have found a method to let users click and scroll exactly the same way they would with a computer mouse, without the device actually being there. Cup your palm, move it around on a table and a cursor on the screen hovers. Tap on the table like you would click a real mouse, and the computer responds. It's one step beyond cordless. It's an invisible mouse. The project, called 'Mouseless,' uses an infrared laser beam and camera to track the movements of the palm and fingers and translate them into computer commands... A working prototype of the Mouseless system costs approximately $20 to build, says Pranav Mistry, who is leading the project."
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