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This question might be odd, but after watching one of Gilbert Strang's lectures I find I am jealous of his great, smoothly flowing chalk that never seems to get dulled down. Anyone know what it is, or a better replacement for the "crayola types"?

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You may be interested in this MO thread, though the problem to be solved there wasn't smooth flow but hands not getting chalky. See also this MO thread about good chalk in the UK. – joriki May 23 '13 at 10:35
up vote 5 down vote accepted

I had completely forgotten about this question and came across it again recently, so I decided to email Dr. Strang. To my surprise, he responded almost immediately. The chalk he used is called Railroad Chalk, and you can find it at many popular online retailers.

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