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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
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 ] [ 4 ] The blackboard is in the collection of the History of Science Museum in Oxford .
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.
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 ...
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.
Romani ite domum on a reconstruction of a Roman settlement in Britain, in the Hull and East Riding Museum. 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.
Simon in the Land of Chalk Drawings is a British-Canadian children's animated series about the adventures of a young boy named Simon, who has a magic blackboard. [2] Things that Simon draws on the chalkboard become real in the Land of Chalk Drawings, a parallel world which Simon can enter by climbing over a fence near his home with a ladder.
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