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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.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 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. Chalkboard art is often used in restaurants, shops or walls. [2] Chalkboard art has also been done on large boards while storytelling on beaches and in Churches.

4. Blackboard system - Wikipedia

   en.wikipedia.org/wiki/Blackboard_system

   Each knowledge source updates the blackboard with a partial solution when its internal constraints match the blackboard state. In this way, the specialists work together to solve the problem. The blackboard model was originally designed as a way to handle complex, ill-defined problems, where the solution is the sum of its parts.

5. Bulletin board - Wikipedia

   en.wikipedia.org/wiki/Bulletin_board

   Well-used bulletin board on the Infinite Corridor at MIT, November 2004 Fanciful drawing of a general store by Marguerite Martyn in the St. Louis Post-Dispatch of October 21, 1906. A man at right reads a notice of a revival service on a bulletin board. Cork, a common bulletin board material Bulletin boards can also be made of felt.

6. Blackboard bold - Wikipedia

   en.wikipedia.org/wiki/Blackboard_bold

   The American Mathematical Society created a simple chalk-style blackboard bold typeface in 1985 to go with the AMS-TeX package created by Michael Spivak, accessed using the \Bbb command (for "blackboard bold"); in 1990, the AMS released an update with a new inline-style blackboard bold font intended to better match Times. [17]

7. As more women turn to testosterone, here's what to know ... - AOL

   www.aol.com/news/more-women-turn-testosterone...

   When Grayson Smith, a 23-year-old woman from Texas, started feeling sluggish and tired in the afternoons, she said a blood test she had low testosterone, a sex hormone traditionally associated ...