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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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. 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 ...

  4. 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 ...

  5. How Classrooms Have Radically Changed Since You Were a Kid - AOL

    www.aol.com/classrooms-radically-changed-since...

    Whiteboards outsold chalkboards 4-to-1 by the new millennium, according to The Atlantic. What's more, even fancier, pricier smart boards — so-called because they're interactive, allowing ...

  6. Tips for Dealing With Colorblindness In Every Day Tasks - WebMD

    www.webmd.com/eye-health/living-with-color-blindness

    Let you sit front and center so you have a good view of the chalkboard. Use labels or patterns for tasks that rely on color, like “red triangle” instead of just “triangle”. Write with only ...

  7. Whiteboard - Wikipedia

    en.wikipedia.org/wiki/Whiteboard

    Whiteboard. A whiteboard (also known by the terms marker board, dry-erase board, dry-wipe board, and pen-board) is a glossy, usually white surface for making non-permanent markings. Whiteboards are analogous to blackboards, but with a smoother surface allowing for rapid marking and erasing of markings on their surface.

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