smitty777 writes: The folks at the Potsdam University have developed a user interface based completely on hand gestures. A small(ish) device worn around the neck is used to track the hand position, allowing the user to draw, type or gesture in the air. You think it looks ridiculous when you can't tell that folks are talking on a cell phone? Imagine a bus full of people gesturing in thin air. Also, don't forget to turn this thing off, or it will look like your cat was walking on your keyboard.