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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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

5. Misophonia: Symptoms, Triggers, Treatment, and More - Healthline

   www.healthline.com/health/misophonia

   feelings of annoyance, irritation, and disgust. anger, rage, or feelings of aggression, including a desire to lash out physically or verbally. nervousness or uneasiness in situations that could ...

6. Dysgraphia: Signs, Diagnosis, Treatment - WebMD

   www.webmd.com/add-adhd/childhood-adhd/dysgraphia...

   Other signs of dysgraphia to watch for include: Cramped grip, which may lead to a sore hand. Difficulty spacing things out on paper or within margins (poor spatial planning) Frequent erasing ...

7. Chalkboard eraser - Wikipedia

   en.wikipedia.org/wiki/Chalkboard_eraser

   A chalkboard eraser is a special type of eraser specifically used to erase chalk markings on slating paint (used on chalkboards and slates ). It is most commonly made of felt strips attached to a handle. Chalkboard erasers are typically broad and rectangular, intended to clear large areas for new content as part of a lecture or presentation.

8. 7 Causes of Tunnel Vision: Plus Symptoms, Treatment & More

   www.healthline.com/health/tunnel-vision

   4. Retinal detachment. A retinal detachment is a medical emergency. This happens when the retina separates from the back of the eye, causing peripheral vision loss. Treatment can resolve the ...

9. Should You Be Worried If You've Been Eating Chalk? - Healthline

   www.healthline.com/health/eating-chalk

   Eating chalk often can disrupt your digestive system and cause damage to your internal organs. risks of eating chalk. Complications of eating chalk consistently may include: tooth damage or ...