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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Most of the photographs show the chalkboard in a moment drawn from the mathematician's work on it, depicting how mathematicians think, work, and communicate with each other. Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted.
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 ...
Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.
A student uses the interactive whiteboard. An interactive whiteboard ( IWB ), also known as interactive board or smart board, is a large interactive display board in the form factor of a whiteboard. It can either be a standalone touchscreen computer used independently to perform tasks and operations, or a connectable apparatus used as a ...
A quick look at the best online support groups for depression. Best for frequent engagement: Anxiety and Depression Association of America. Best for 24/7 support: 7 Cups. Best for virtual meetups ...
Chalkboard art. Children's drawing on a chalkboard. Chalkboard art or chalk art is the use of chalk on a blackboard as a visual art. [1] It is similar to art using pastels and related to sidewalk art that often uses chalk. Chalkboard art is often used in restaurants, shops or walls. [2]
List of episodes. " Four Regrettings and a Funeral " is the third episode of the twenty-fifth season of the American animated television series The Simpsons and the 533rd episode of the series. It first aired on the Fox network in the United States on November 3, 2013. It was written by Marc Wilmore and directed by Mark Kirkland.
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