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  2. Dark matter - Wikipedia

    en.wikipedia.org/wiki/Dark_matter

    History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...

  3. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Coupon. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product . Customarily, coupons are issued by manufacturers of consumer packaged goods [1] or by retailers, to be used in retail stores as a part of sales promotions. They are often widely distributed through mail ...

  4. Teespring - Wikipedia

    en.wikipedia.org/wiki/Teespring

    https://spri.ng. Teespring (Spring, Inc.) is an American company that operates Spring, a social commerce platform that allows people to create and sell custom products. [1] The company was founded in 2011 by Walker Williams and Evan Stites-Clayton in Providence, Rhode Island. [2] By 2014, the company had raised $55 million in venture capital ...

  5. Time constant - Wikipedia

    en.wikipedia.org/wiki/Time_constant

    In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. [1] [note 1] The time constant is the main characteristic unit of a first-order LTI system. In the time domain, the usual choice to ...

  6. Low-pass filter - Wikipedia

    en.wikipedia.org/wiki/Low-pass_filter

    A low-pass filter is a filter that passes signals with a frequency lower than a selected cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. The exact frequency response of the filter depends on the filter design. The filter is sometimes called a high-cut filter, or treble-cut filter in audio applications.

  7. Star Awards 2014 - Wikipedia

    en.wikipedia.org/wiki/Star_Awards_2014

    Star Awards 20 (also SA20, Chinese: 红星大奖 20) was a double television award ceremony which was held in Singapore. It is part of the annual Star Awards organised by Mediacorp for the two free-to-air channels, Mediacorp Channels 8 and U. The twentieth installment of Star Awards was broadcast live on Channel 8, on 20 and 27 April 2014.

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