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2. Infrared cut-off filter - Wikipedia

   en.wikipedia.org/wiki/Infrared_cut-off_filter

   Thus a blue filter makes the picture look blue. A blue filter marginally allows more light in the blue wavelength to pass resulting in a slight shift of the color temperature of the photo to a cooler color. Because of this, the term "IR filters" is commonly used to refer to filters that pass infrared light while completely blocking other ...

3. Business card - Wikipedia

   en.wikipedia.org/wiki/Business_card

   A Oscar Friedheim card cutting and scoring machine from 1889, capable of producing up to 100,000 visiting and business cards a day. Business cards are cards bearing business information about a company or individual. [1] [2] They are shared during formal introductions as a convenience and a memory aid.

4. Blue light spectrum - Wikipedia

   en.wikipedia.org/wiki/Blue_light_spectrum

   The blue light spectrum is an essential part of the visible spectrum with wavelengths of about 400-480 nm. [1] Blue light is primarily generated by Light-Emitting Diodes (LED) lighting and digital screens, it has now become prevalent in the world around us. [2] LED lighting creates white light by combining blue light with other wavelengths ...

5. Wratten number - Wikipedia

   en.wikipedia.org/wiki/Wratten_number

   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 and its spectral characteristics, and these numbers can be grouped into broad categories, but the numbering system is arbitrary within a group and ...

6. Top economist: Buyers and sellers should brace ... - AOL

   www.aol.com/finance/top-economist-buyers-sellers...

   Compass’s chief executive, Robert Reffkin, recently said the magic mortgage rate number was anything below 6%, and it could be what brings buyers and sellers back. What’s worse is home prices ...

7. Shuji Nakamura - Wikipedia

   en.wikipedia.org/wiki/Shuji_Nakamura

   Shuji Nakamura (中村 修二, Nakamura Shūji, born May 22, 1954) is a Japanese-American electronic engineer and inventor of the blue LED, a major breakthrough in lighting technology. [5] Nakamura specializes in the field of semiconductor technology, and he is a professor of materials science at the College of Engineering of the University of ...