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Sony's prototype headphones put a digital running coach in your ears
Tech giants across the world are having to do something they probably never thought they'd have to: cook up a wearables strategy. Sony's is still very much in flux, but until now it's mostly centered around gadgets that go on your wrists and -- in one crazy case -- a pair of Google-esque smart glasses. This time though, Sony's wondering out loud about the future of gadgets that go in your ears (earables?), and to that end it's cooked up a kooky prototype it calls the B-Trainer.
