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Einstein's chalk.jpg

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Chalk in use on a blackboard. (TNG-R: "The Nth Degree")

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  • Chalk

    Chalk was a soft, white form of calcium carbonate, often used for drawing. In 1953, Kay Eaton...

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current18:07, December 3, 2015Thumbnail for version as of 18:07, December 3, 2015694 × 530 (94 KB)LauraCC (Talk | contribs)Chalk in use on a blackboard. ({{TNG|The Nth Degree}}) {{Image paramount}}

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