Look! No hands! — When devices go hand free

James McCann looks at computing as a series of interface changes, leading directly to a revolution in grocery shopping.

“At the moment, this generation of devices uses a touch interface with the finger,” the chief operating officer of Ahold USA explained. “The one before that was a mouse, the one before that was a keyboard, the one before that was a punch card, the one before that was a telegraph tapper. The next big interface change is going to be the wearable devices where peopl

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