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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Writing from the point of view as a mathematician, Adhemar Bultheel calls it "a wonderful mirror" that could help other mathematicians think about what they do, [2] while Elizaveta Dubrovina finds it to be "a nostalgic reminder of the tactility of chalk and the conviviality of in-person collaboration" in what has become a largely online world ...
Writing lines is frequently satirised in popular culture as "a symbol of futile, old-fashioned, one-size-fits-all schoolhouse discipline", as in the chalkboard gag seen at the beginning of many episodes of The Simpsons, where Bart Simpson writes lines on a chalkboard as a punishment.
Dysgraphia is a learning disability that results in unusual and distorted handwriting. Writing homework can be challenging for kids with the condition. WebMD explains the signs and strategies to help.
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 ...
With her school shut because of the coronavirus, Tolu Alagba kneels as she copies down class notes from a communal village chalkboard, the closest thing to online lessons on an island with no ...
Chalk is mined for use in industry, such as for quicklime, bricks and builder's putty, and in agriculture, for raising pH in soils with high acidity. It is also used for "blackboard chalk" for writing and drawing on various types of surfaces, although these can also be manufactured from other carbonate-based minerals, or gypsum .
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 ( complex numbers ).
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