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  2. Dollar Shave Club - Wikipedia

    en.wikipedia.org/wiki/Dollar_Shave_Club

    Dollar Shave Club was founded by Mark Levine and Michael Dubin. The pair met at a party and spoke of their frustrations with the cost of razor blades. With their own money and investments from start-up incubator Science Inc., they began operations in January 2011 and launched their website in April 2011. [6] [7] [8] [9]

  3. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    The frequency response plot from Butterworth's 1930 paper. [1] The Butterworth filter is a type of signal processing filter designed to have a frequency response that is as flat as possible in the passband. It is also referred to as a maximally flat magnitude filter.

  4. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    20 is the third magic number in physics. In chemistry, it is the atomic number of calcium. Biology. The number of proteinogenic amino acids that are encoded by the standard genetic code; In many disciplines of developmental psychology, adulthood starts at age 20.

  5. Google Docs - Wikipedia

    en.wikipedia.org/wiki/Google_Docs

    Google Docs is an online word processor included as part of the free, web-based Google Docs Editors suite offered by Google, which also includes Google Sheets, Google Slides, Google Drawings, Google Forms, Google Sites and Google Keep. Google Docs is accessible via an internet browser as a web-based application and is also available as a mobile ...