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>Clearly people talking to their devices is cool, but annoying to others on the train and potentially embarrassing

Hopefully Subvocal Recognition[1] can improve enough that it will solve this particular problem. They've already created non-invasive forms[2] of electronic signal relay that could be used for this as well.

It definitely will be fun to watch. I'm with you on the skepticism of video capture devices like Kinect being the solution to non-touch interfaces. We'll see though :D



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