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2. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

   www.aol.com/noise-canceling-headphones-harmful...

   The good news is that noise-canceling headphones can benefit your ears in certain situations. A few of those situations could be blocking out background noise in a busy coffee shop, blaring ...

3. These 6 Comfy Earbuds Won't Have Your Ears Begging for ... - AOL

   www.aol.com/6-comfy-earbuds-wont-ears-181100568.html

   Dime 3 In-Ear Wireless Earbuds. Earbuds are worth investing in, but sometimes, a backup pair is the best way to protect that investment. Keeping a budget-friendly pair of earbuds around allows you ...

4. I Have Teeny Little Ears and These Earbuds *Actually* Stay Put

   www.aol.com/lifestyle/teeny-little-ears-earbuds...

   Invisible Earbuds. Invisible is the perfect name for these teeny earbuds. They're barely noticeable unless you're aware that they're there. They slip into the ear and stay there. As a low-budget ...

5. Head-related transfer function - Wikipedia

   en.wikipedia.org/wiki/Head-related_transfer_function

   HRTF filtering effect. A head-related transfer function (HRTF) is a response that characterizes how an ear receives a sound from a point in space. As sound strikes the listener, the size and shape of the head, ears, ear canal, density of the head, size and shape of nasal and oral cavities, all transform the sound and affect how it is perceived, boosting some frequencies and attenuating others.

6. Optics and vision - Wikipedia

   en.wikipedia.org/wiki/Optics_and_vision

   Optics and vision. Vision of humans and other organisms depends on several organs such as the lens of the eye, and any vision correcting devices, which use optics to focus the image. The eyes of many animals contains a lens that focuses the light of its surroundings onto the retina of the eye. This lens is essential to producing clear images ...

7. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Headphones are also known as earphones[1] or, colloquially, cans. [2] Circumaural (around the ear) and supra-aural (over the ear) headphones use a band over the top of the head to hold the drivers in place. Another type, known as earbuds or earpieces, [1] consists of individual units that plug into the user's ear canal.