When nearly 30 years ago Dr. Jacob Fraden invented an ear thermometer working on this second principle, the infrared light sensor was so large that he needed a narrow gold-plated reflective tube to channel the light from the ear drum to the sensor.

FORBES: Body temperature.

Built from aluminum and durable rubber, the headphones feature a custom-made, ultra-light acoustic fabric on the ear pad covers.

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Potential signs and symptoms of a concussion include headache, dizziness, nausea, ear ringing, sensitivity to light and sounds, slurred speech, impaired memory or judgment, as well as changes in reaction time or balance.

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After a brief unboxing, this editor wrapped each set around his head, finding the headband tension of both the over-ear N11 and the on-ear NLa to be just as light as the accessories themselves, squeezing my skull with only the gentlest of pressure.

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Bright, plucky, light audio dances its way from the large and comfortable ear-cups.

ENGADGET

When his mistake emerged, Bob would have had a metaphorical clip round the ear from the gaffer and would be sent out at first light the next day with brush and paint to correct his mistake.

BBC: Lines painted in early Spring...

And since ultrasound travels in a tight line akin to laser light, the emergent tones are audible only in a narrow, cylindrical path from source to ear.

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