Engineering

Sound-powered sensors stand to save millions of batteries

Sensors that monitor infrastructure, such as bridges or buildings, or are used in medical devices, such as prostheses for the deaf, require a constant supply of power. The energy for this usually comes from batteries, which ...

Engineering

How spider silk research led to a new kind of microphone

The human ability to notice the world around us is made possible by our sense organs—eyes, ears, nose, skin and tongue—which are so efficient that most people don't consciously think about them. Others, like Distinguished ...

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Sound

Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations.

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