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  2. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

  3. Writing lines - Wikipedia

    en.wikipedia.org/wiki/Writing_lines

    Writing lines is a long-standing form of school discipline, having survived even as other old punishments such as school corporal punishment and dunce hats fell out of favour in the 20th century. [2] In a 1985 study, over half of respondent teachers in an English-speaking country indicated awareness of the use of writing to discipline students. [5]

  4. Blackboard bold - Wikipedia

    en.wikipedia.org/wiki/Blackboard_bold

    Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets ( natural numbers ), ( integers ), ( rational numbers ), ( real numbers ), and ...

  5. Chalkboard scraping - Wikipedia

    en.wikipedia.org/wiki/Chalkboard_scraping

    Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...

  6. 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 ...

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  8. Einstein's Blackboard - Wikipedia

    en.wikipedia.org/wiki/Einstein's_blackboard

    Einstein's Blackboard is a blackboard [1] which physicist Albert Einstein (1879–1955) used on 16 May 1931 during his lectures while visiting the University of Oxford in England. [2] [3] The blackboard is in the collection of the Museum of the History of Science in Oxford. [4] [5] The equations in the blackboard are related to the cosmological ...

  9. Slate (writing) - Wikipedia

    en.wikipedia.org/wiki/Slate_(writing)

    The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. [1] A slate pencil was used to write on the slate board. It was made from a softer and lighter coloured stone such as shale or chalk. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes ...

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