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Dream chalk

  1. Nov 12, 2011 #1
    I thought all chalk was more or less the same so most people would only use the cheapest stuff. Turns out I'm wrong:

    check it out



  2. jcsd
  3. Nov 12, 2011 #2


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    Gold Member

    I'll bet I could write an incorrect proof with it
  4. Nov 12, 2011 #3


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    Gold Member

    Who uses chalk anymore?
  5. Nov 12, 2011 #4
    Chalk it up to the chalk?
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