"...On a chilly morning in early January, I joined a hundred students in a lecture hall on the Georgia Tech campus for a class called Mobile and Ubiquitous Computing. The professor, Thad Starner, looked up at his audience of aspiring programmers, industrial designers, roboticists, and user-interface specialists. He is forty-four, with a boyish face and sideburns that yearn for the 1990s. He wore, as he often does, a black T-shirt and black jeans. “In this class we’re going to talk about four main things,” he said. “Privacy, power and heat, networking on- and off-body, and interface. Every time you make any decision on any four of these dimensions, it’s going to affect the others. It’s always a balancing act.”

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A piece of history on the PCG.