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The world's first purpose-built hydrogen-powered bike could be fitted with an artificial "vroom" because of worries its silence might be dangerous.


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The team says any noise from the concept aircraft, known as the SAX-40, would be "imperceptible" beyond the boundaries of an airport. It would also burn far less fuel than conventional planes.


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The prototype device could allow people to conduct silent phone conversations. The technology measures the tiny electrical signals produced by muscles used when someone speaks.


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