Blackboard
From The Art and Popular Culture Encyclopedia
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"Calling the meek and the humble / Welcome to Blackboard Jungle / So don't you fumble, just be humble."--Black Board Jungle (1973) |
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A blackboard (also known as 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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
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