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  2. Radio-controlled aircraft - Wikipedia

    en.wikipedia.org/wiki/Radio-controlled_aircraft

    Various scale sizes of RC scale aircraft have been built in the decades since modern digital-proportional, miniaturized RC gear came on the market in the 1960s, and everything from indoor-flyable electric powered RC Scale models, to "giant scale" RC Scale models, in scale size ranges that usually run from 20% to 25%, and upwards to 30 to 50% ...

  3. Coupon - Wikipedia

    en.wikipedia.org/wiki/Coupon

    Believed to be the first coupon ever, this ticket for a free glass of Coca-Cola was first distributed in 1888 to help promote the drink. By 1913, the company had redeemed 8.5 million tickets. [6] Coca-Cola's 1888-issued "free glass of" is the earliest documented coupon. [6] [7] Coupons were mailed to potential customers and placed in magazines ...

  4. Horizon Forbidden West - Wikipedia

    en.wikipedia.org/wiki/Horizon_Forbidden_West

    Horizon Forbidden West is a 2022 action role-playing game developed by Guerrilla Games and published by Sony Interactive Entertainment.The sequel to Horizon Zero Dawn (2017), the game is set in a post-apocalyptic version of the Western United States, recovering from the aftermath of an extinction event caused by a rogue robot swarm.

  5. Mom's Long Covid Turns Out to Be Necrotising Disease of the ...

    www.aol.com/moms-long-covid-turns-necrotising...

    A U.K. mom of three thought she had Long Covid — until doctors discovered that she had a necrotising disease that forced her into a coma.. The long health journey for Sam Lewis, 38, began in ...

  6. Horizon problem - Wikipedia

    en.wikipedia.org/wiki/Horizon_problem

    The horizon problem (also known as the homogeneity problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. It arises due to the difficulty in explaining the observed homogeneity of causally disconnected regions of space in the absence of a mechanism that sets the same initial conditions everywhere.

  7. RC time constant - Wikipedia

    en.wikipedia.org/wiki/RC_time_constant

    rise time (20% to 80%) rise time (10% to 90%) t r ≈ 2.2 τ ≈ 0.35 f c {\displaystyle t_{r}\approx 2.2\tau \approx {\frac {0.35}{f_{c}}}} In more complicated circuits consisting of more than one resistor and/or capacitor, the open-circuit time constant method provides a way of approximating the cutoff frequency by computing a sum of several ...

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