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2. Orthopedic mattress - Wikipedia

   en.wikipedia.org/wiki/Orthopedic_mattress

   An orthopedic mattress (or orthopaedic mattress) is a mattress designed to support the joints, back and overall body. The product is informed by the medical study of orthopaedics which focuses on disorders or deformities of the spine and joints. Orthopaedic mattresses have been created to combat the problems one might experience with a bad back ...

3. Mattress - Wikipedia

   en.wikipedia.org/wiki/Mattress

   The mattress replacement cycle is a key driver of income and profits for the mattress industry – a five-year replacement cycle yields double the sales of a 10-year replacement cycle, for instance – so the mattress industry has a financial incentive to shorten the replacement cycle.

4. Rechargeable battery - Wikipedia

   en.wikipedia.org/wiki/Rechargeable_battery

   A rechargeable battery is only one of several types of rechargeable energy storage systems. [46] Several alternatives to rechargeable batteries exist or are under development. For uses such as portable radios , rechargeable batteries may be replaced by clockwork mechanisms which are wound up by hand, driving dynamos , although this system may ...

5. The 9 best rechargeable hearing aids, according to hearing ...

   www.aol.com/lifestyle/best-rechargeable-hearing...

   These high-tech prescription hearing aids employ a sort of artificial intelligence technology known as a Deep Neural Network BrainHearing system to support the way your brain interprets sound by ...

6. Nickel–metal hydride battery - Wikipedia

   en.wikipedia.org/wiki/Nickel–metal_hydride_battery

   Lithium-ion batteries can deliver extremely high power and have a higher specific energy than nickel–metal hydride batteries, [40] but they were originally significantly more expensive. [41] The cost of lithium batteries fell drastically during the 2010s and many small consumer devices now have non-consumer-replaceable lithium batteries as a ...

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.