Google Glass, the eyewear that puts smartphone applications in a user's line of sight, is meeting with varying degrees of enthusiasm as the first wave of consumers test the $1,500 devices on public streets. While critics deride them as "creepy" and a "privacy nightmare," supporters rave about their futuristic capabilities. Devices like Google Glass "can help the user pay attention to the real world as opposed to retreating from it into a laptop or mobile phone screen," said Thad E. Starner, a professor at the Georgia Institute of Technology.

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