PC makers soon will sell devices that allow people to move computer documents with simple hand gestures, reports the New York Times. The technology industry is going retro, moving away from remote controls, mice, and joysticks to something that arrives without batteries, wires, or a user manual—the human hand. One of the most significant changes to human-device interfaces since the mouse appeared next to computers in the early 1980s, the technology was on display in private sessions during the Consumer Electronics Show in Las Vegas last week. Past attempts at similar technology have proved clunky and disappointing....

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