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  2. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...

  3. YouTube Kids - Wikipedia

    en.wikipedia.org/wiki/YouTube_Kids

    YouTube Kids has faced criticism from advocacy groups, particularly the Fairplay Organization, for concerns surrounding the app's use of commercial advertising, as well as algorithmic suggestions of videos that may be inappropriate for the app's target audience, as the app has been associated with a controversy surrounding disturbing or violent ...

  4. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.

  5. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    The 1/4-turn shaft carries (also, each column) gears with 12, 16, and 20 teeth, for 3, 4, and 5. Digits [1] and [2] are handled by 12 and 24-tooth gears on the 1/12-revolution shaft. Practical design places the 12th-rev. shaft more distant, so the 1/4-turn shaft carries freely-rotating 24 and 12-tooth idler gears.

  6. Schoolhouse Rock! - Wikipedia

    en.wikipedia.org/wiki/Schoolhouse_Rock!

    In addition to episodes describing the human body's anatomical systems (the nervous, circulatory, skeletal and digestive systems each received a music video), episodes describing physical sciences such as astronomy, meteorology and electricity were also included, as was "The Energy Blues," an environmentalism-themed video.

  7. 1/4 + 1/16 + 1/64 + 1/256 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/4_%2B_1/16_%2B_1/64_%2B...

    Today, a more standard phrasing of Archimedes' proposition is that the partial sums of the series 1 + ⁠ 1 / 4 ⁠ + ⁠ 1 / 16 ⁠ + ⋯ are: + + + + = +. This form can be proved by multiplying both sides by 1 − ⁠ 1 / 4 ⁠ and observing that all but the first and the last of the terms on the left-hand side of the equation cancel in pairs.

  8. Chotoonz TV - Wikipedia

    en.wikipedia.org/wiki/Chotoonz_TV

    Chotoonz TV is a children's animation channel on YouTube and other digital platforms. [2] [3] Chotoonz TV predominantly features compilations encompassing chase comedy cartoons [4] such as Pakdam Pakdai (Rat-a-Tat) and Bunty Aur Billy (Cat & Keet). [5]

  9. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Used by Heller for model ships, and proposed by the Japanese to supersede 1:144 scale trains. Models which are commonly made in scale at 1:150 are commercial airliners - such as the Airbus A320, Boeing 777 all the way to the jumbo jets - the Airbus A380 & Boeing 747. [8] 1:148: 2.059 mm: Model railways (British N) British N model railroad scale ...

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    1/4 scale calculator parts and functions youtube video kids cartoons full