Comment: Imaginary phone makes calls on your palm

[news]

Sean Gustafson unlocks his iPhone by swishing a finger across its screen and pecking out a four-digit PIN on its keypad. It's unremarkable save for one small thing: there is no phone in his hand. Instead, he's pressing invisible "buttons" on his palm – to operate an imaginary cellphone. And, astonishingly, it works.

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