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2. Blackboard - Wikipedia

   en.wikipedia.org/wiki/Blackboard

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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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

4. Blackboard Learn - Wikipedia

   en.wikipedia.org/wiki/Blackboard_Learn

   Blackboard Learn. Blackboard Learn (previously the Blackboard Learning Management System) is a web-based virtual learning environment and learning management system developed by Blackboard Inc. The software features course management, customizable open architecture, and scalable design that allows integration with student information systems ...

5. Chalkboard art - Wikipedia

   en.wikipedia.org/wiki/Chalkboard_art

   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.

6. Free Online Games: Play board games, card games, casino games ...

   www.aol.com/games

   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.

7. CALABASH CHALK - Uses, Side Effects, and More - WebMD

   www.webmd.com/.../ingredientmono-1640/calabash-chalk

   Learn more about CALABASH CHALK uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain CALABASH CHALK.

8. Do Not Erase: Mathematicians and Their Chalkboards

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

   The title of the book harks back to the legend of Archimedes commanding his killer not to erase his circles. In modern times, adding "do not erase" as an annotation on a filled-up chalkboard is a familiar way to request the preservation of its contents. By photographing these chalkboards, Wynne has given them significantly more permanence than they otherwise would have. [2]

9. 9 Best Low Cost and Free Online Therapy Options in 2024

   www.healthline.com/.../online-therapist-for-free

   Free online therapy services are often volunteer-based. However, there are low cost options and free resources available that provide professional help.