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2. 5 Travel Headphones to Drown Out All That Unwanted Noise - AOL

   www.aol.com/lifestyle/5-travel-headphones-drown...

   We tested headphones from brands like Bose, Sony, Bowers & Wilkins, and more to find the very best headphones for travel. Read our rankings ahead.

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

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

   Key Takeaways: As the FDA does not regulate headphone volume, it’s up to us to self-regulate our listening volume. Noise canceling headphones can help keep your volume within a safe range, so ...

4. Our Favorite Headphones for Kids - AOL

   www.aol.com/lifestyle/favorite-headphones-kids...

   Comes with the normal 3.5mm audio jack and offers surprisingly deep bass sound for headphones in this category. Jelly Comb. Buy. Designed for children 6 years and older, Jelly Comb’s foldable ...

5. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   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. HPDs reduce the level of the noise entering the ear. HPDs can also protect against other effects ...

6. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...

7. Speed of sound - Wikipedia

   en.wikipedia.org/wiki/Speed_of_sound

   e. The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.