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I recently realized what my killer app would be for a screen that is always visible: an infrared camera. Being able to see into the infrared spectrum would give you "superhuman" powers, like never accidentally touching a hot surface, easily finding and insulating the spots where your house is losing heat during the winter, and being able to see pedestrians while driving at night. I think it will take that kind of incredible practicality to amaze people so much that they can't justify opposing Google Glass.