SPELblog
the very unofficial blog loosely associated with the graduate program in philosophy
30 October 2010
ooh, the chalk
http://www.boston.com/bostonglobe/ideas/articles/2010/10/03/the_stradivarius_of_chalk/
also here:
http://mathoverflow.net/questions/26267/where-to-buy-premium-white-chalk-in-the-u-s-like-they-have-at-rims
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