[math-fun] Draft of December 31 blog post

I've written something different for this month: a (mostly) tongue-in-cheek promotion for an upcoming mathematical holiday called "Thirdsday". (The holiday is bogus; the math is real.) You can read the current draft at http://mathenchant.org/043-share.pdf . Suggestions are welcome, especially suggestions for mathematically interesting occurrences of the number 1/3. (I'm saving "the volume of a pyramid is 1/3 times the area of the base times the height" and "the integral of x^2 from x=0 to x=1 is 1/3" for the next Thirdsday, just over a decade from now.) Jim Propp