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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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

   Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted. [1] Many of their comments relate to their tactile pleasure in using chalk, to the semi-permanence of partially-legible erasures from chalkboards, and to the pacing the use of chalk imparts ...

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. Free Online Board Games - No Downloads - AOL Games

   www.aol.com/games/board

   Nothing to download, play free board games right now! Browse and play any of the free online board games for free against the AI or against your friends. Enjoy classic board games such as Chess ...

6. 10 Best Online Workout Programs - Healthline

   www.healthline.com/health/fitness/best-online...

   A quick look at the best online workout programs. Best overall: Peloton Digital. Best for strength training: Jefit. Best for dancers: The Sculpt Society. Best for yoga: Glo. Best for quick ...

7. Simon in the Land of Chalk Drawings - Wikipedia

   en.wikipedia.org/wiki/Simon_in_the_Land_of_Chalk...

   1974. ( 1974) –. 1976. ( 1976) Simon in the Land of Chalk Drawings is a British children's animated series about the adventures of a young boy named Simon, who has a magic blackboard. [1] Things that Simon draws on the chalkboard become real in the Land of Chalk Drawings, which Simon can enter by climbing over a fence near his home with a ...

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

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

   Calabash chalk is a type of clay. Some people, especially pregnant women, eat calabash chalk as medicine. But calabash chalk contains heavy metals like arsenic and lead, which can be dangerous ...

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 ...