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2. 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 ...

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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

5. 6 Tips for Eye Health and Maintaining Good Eyesight - WebMD

   www.webmd.com/eye-health/good-eyesight

   Look 20 feet away for 20 seconds. Get up at least every 2 hours and take a 15-minute break. 6. Visit Your Eye Doctor Regularly. Everyone needs a regular eye exam, even young children. It helps ...

6. Pill Identifier - Find Pills by Color, Shape, Imprint, or Picture

   www.webmd.com/pill-identification

   The physical qualities of the pill make an imprint impossible. ... call 911 or contact your local poison center through a toll-free helpline at 800-222-1222. As a rule, you should never take pills ...

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.