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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

    fulltouch-thumb-300x222-21507.jpg

    http://www.boston.com/bostonglobe/ideas/brainiac/2010/09/what_excites_a.html

    http://www.improbable.com/2011/11/11/the-chalk-of-some-mathematicians-dreams/
     
  2. jcsd
  3. Nov 12, 2011 #2

    Pythagorean

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    Gold Member

    I'll bet I could write an incorrect proof with it
     
  4. Nov 12, 2011 #3
    Who uses chalk anymore?
     
  5. Nov 12, 2011 #4
    Chalk it up to the chalk?
     
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