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2. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

   www.aol.com/entertainment/20-off-raycon-earbuds...

   Raycon has an amazing selection of best selling earbuds, headphones and more which rival the most popular brands — but best of all, they’re significantly less expensive. And right now, you can ...

3. The 6 Best Air Purifiers for Any Room in the House - AOL

   www.aol.com/lifestyle/6-best-air-purifiers-room...

   These quiet and effective air purifiers are the best of 2023. Check out the expert-recommended air purifiers that clean out allergens, mold spores, and more.

4. 5 Combination Air Purifier and Humidifiers for a Cleaner Home

   www.aol.com/lifestyle/5-combination-air-purifier...

   Here, five air purifier and humidifiers that do this dual task the best, all a fit for making your home a little cleaner. Smart 4-in-1 Air Purifier & Humidifier

5. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke . The commercially graded air purifiers are manufactured as either small ...

6. Air ioniser - Wikipedia

   en.wikipedia.org/wiki/Air_ioniser

   An air ioniser (or negative ion generator or Chizhevsky's chandelier) is a device that uses high voltage to ionise (electrically charge) air molecules. Negative ions, or anions, are particles with one or more extra electrons, conferring a net negative charge to the particle. Cations are positive ions missing one or more electrons, resulting in ...

7. Wratten number - Wikipedia

   en.wikipedia.org/wiki/Wratten_number

   Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information (the 80A–80D are blue, the next filters in numerical order, 81A–81EF, are orange); letters almost always ...