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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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. Do Not Erase: Mathematicians and Their Chalkboards

    en.wikipedia.org/wiki/Do_Not_Erase:...

    Most of the photographs show the chalkboard in a moment drawn from the mathematician's work on it, depicting how mathematicians think, work, and communicate with each other. Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted.

  4. 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 ...

  5. Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

  6. The 28 Top Free Fitness YouTube Channels of 2021 - Healthline

    www.healthline.com/health/fitness/free-youtube...

    15. Rebecca-Louise. Rebecca-Louise offers dozens of full-body workouts that can be done from the comfort of your own home with little to no equipment. You can opt for a 40-minute full-body workout ...

  7. Interactive whiteboard - Wikipedia

    en.wikipedia.org/wiki/Interactive_whiteboard

    A student uses the interactive whiteboard. An interactive whiteboard ( IWB ), also known as interactive board or smart board, is a large interactive display board in the form factor of a whiteboard. It can either be a standalone touchscreen computer used independently to perform tasks and operations, or a connectable apparatus used as a ...

  8. Bart the Genius - Wikipedia

    en.wikipedia.org/wiki/Bart_the_Genius

    List of episodes. " Bart the Genius " is the second episode of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on January 14, 1990. [4] It was the first episode written by Jon Vitti. It is the show's first normal episode as well as the first to use the signature title sequence ...

  9. 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]

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