@Ben_E
With every discussion about touch screens, comes the comment about traditional Input Methods being far superior. And at this point they are. I do believe there will be a revolutionary new method of input in the near future. Beyond touch/verbal/typing.
It will be (my humble opinion of course) something akin to hand gestures. And lets face it, typing IS just a finger gesture that connects to a plastic board that detects the depression of the finger. I foresee a system of hand gestures that will allow, once mastered, an individual to input the entire alphabet in the same amount of time it takes to type it.
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