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  2. Hearing protection device - Wikipedia

    en.wikipedia.org/wiki/Hearing_protection_device

    A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss. HPDs reduce the level of the noise entering the ear. HPDs can also protect against other effects of noise exposure such as tinnitus and ...

  3. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

  4. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Noise control is an active or passive means of reducing sound emissions, often for personal comfort, environmental considerations, or legal compliance. Active noise control is sound reduction using a power source. Passive noise control is sound reduction by noise-isolating materials such as insulation, sound-absorbing tiles, or a muffler rather ...

  5. Why You Don’t Need to Worry (Too Much) About Mercury ... - AOL

    www.aol.com/why-don-t-worry-too-144200815.html

    For most men, though, mercury consumption isn’t an issue. “Most healthy adults would need to consume a lot of higher-mercury fish over long periods of time to develop any symptoms of mercury ...

  6. Why Do My Ears Itch? (And How to Make It Stop) - AOL

    www.aol.com/lifestyle/why-ears-itch-stop...

    Key Takeaways: Itchy ears are not uncommon when adjusting to hearing aids, as it takes time for the ear to adjust to the presence of a hearing aid. Other common causes of itchy ears includes ...

  7. Why sudden loud booms sometimes occur when it's very ... - AOL

    www.aol.com/weather/why-sudden-loud-booms...

    During extreme cold events, you may hear a loud boom and feel like you have experienced an earthquake. However, this event was more likely a cryoseism, also known as an ice quake or a frost quake ...

  8. Ray J - Wikipedia

    en.wikipedia.org/wiki/Ray_J

    Sanctuary. Atlantic. Elektra. EastWest. Musical artist. Website. rayj .com. William Ray Norwood Jr. (born January 17, 1981), [1] known professionally as Ray J, is an American R&B singer, songwriter, television presenter, and actor. Born in McComb, Mississippi and raised in Carson, California, he is the younger brother of singer and actress Brandy.

  9. Should you stretch before exercise? After? Never? Here’s what ...

    www.aol.com/lifestyle/stretch-exercise-never...

    Don't do it if it hurts. After exercise, “light stretching is OK, as long as you don't reach a point where you're feeling pain,” Behm said. Since your muscles will be warm by that point ...