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2. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Various earmuff hearing protectors. Sound levels of some daily activities. 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.

3. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   Hearing protector fit-testing is a method that measures the degree of noise reduction obtained from an individual wearing a particular hearing protection device (HPD) - for example, a noise canceling earplug or earmuff. Fit testing is necessary due to the fact that noise attenuation varies across individuals.

4. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   The PAR is regarded as more accurate than the NRR because it is calculated per individual and per hearing protection device, while NRR is a generalized estimate of potential sound reduction based on the protection provided to a small population of people.

5. Hearing - Wikipedia

   en.wikipedia.org/wiki/Hearing

   Hearing protection is the use of devices designed to prevent noise-induced hearing loss (NIHL), a type of post-lingual hearing impairment. The various means used to prevent hearing loss generally focus on reducing the levels of noise to which people are exposed.

6. Hearing aid - Wikipedia

   en.wikipedia.org/wiki/Hearing_aid

   Hearing aids are used for a variety of pathologies including sensorineural hearing loss, conductive hearing loss, and single-sided deafness. Hearing aid candidacy was traditionally determined by a Doctor of Audiology, or a certified hearing specialist, who will also fit the device based on the nature and degree of the hearing loss being treated.

7. Is It Safe to Use Expired Vitamins? The Truth About Vitamin ...

   www.aol.com/vitamins-expire-nutritionists-weigh...

   When you buy a bottle of vitamins from a nutrition store, you’ll probably notice a best-by date on the bottom of the jar. But that inscribed number isn’t a hard-and-fast rule—there is some ...

8. The US still has not had a woman leader – here are the ...

   www.aol.com/us-still-not-had-woman-100042106.html

   The first woman was elected to lead a country 64 years ago. Here’s a look at where, and when, women have secured national leadership positions since then.

9. Legibility - Wikipedia

   en.wikipedia.org/wiki/Legibility

   Legibility is the ease with which a reader can decode symbols. In addition to written language, it can also refer to behaviour [1] or architecture, [2] for example. From the perspective of communication research, it can be described as a measure of the permeability of a communication channel.