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2. Blackboard - Wikipedia

   en.wikipedia.org/wiki/Blackboard

   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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

3. Do Not Erase: Mathematicians and Their Chalkboards

   en.wikipedia.org/wiki/Do_Not_Erase:...

   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.

4. Chalkboard scraping - Wikipedia

   en.wikipedia.org/wiki/Chalkboard_scraping

   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 ...

5. Homeless woman was living inside Michigan rooftop store sign ...

   www.aol.com/news/homeless-woman-living-inside...

   The Family Fare store is in a retail strip with a triangle-shaped sign at the top of the building. The sign structure, probably 5 feet (1.5 meter) wide and 8 feet (2.4 meters) high, has a door and ...

6. These wise quotes from Maya Angelou will inspire you every day

   www.aol.com/news/25-maya-angelous-most-iconic...

   Maya Angelou quotes. “Life is going to give you just what you put in it. Put your whole heart in everything you do, and pray, then you can wait.”. “In all my work, what I try to say is that ...

7. Blackboard bold - Wikipedia

   en.wikipedia.org/wiki/Blackboard_bold

   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 ...