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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
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 ...
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 Museum of the History of Science in Oxford. [ 5 ][ 6 ] The equations in the blackboard are related to the ...
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Pool: Lucky Break 8 Ball. At Lucky Break Pool, play free online pool hall 8-ball with your friends! Chalk up your favorite pool cue, customize the billiards table, and chat with other players. You ...
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