Google Glass promised an eye-level computer with voice commands and a built-in camera. The Explorer Edition cost $1,500 and turned early adopters into walking product demos, while everyone nearby got to wonder whether they were being recorded. Google halted consumer sales in January 2015; the enterprise version lived on, but the great public face-computer future was quietly asked to leave the room.
Sources: TIME · Reuters via Voice of America
Image: Ted Eytan / Wikimedia Commons, CC BY-SA 2.0.