If you’re a seasoned international rail traveler you will no doubt have become used to the various sounds of electric locomotives and multiple units as they start up. If you know anything about ...

the next phase of the process was to lay out an array of LEDs on a breadboard in the shape of the human heart’s electrical system. Now you’ve got a pulsing LED, heart sounds, and a lighted ...

Electric cars have to produce an external sound at low speeds to make pedestrians aware of their presence. This is usually a hum – or a classical melody, in the case of the Fiat 500e – but at ...