Included for a bit of cultural diversity: MR2198856 (2007c:60074) Robinson, Thomas(1-RTG); Vijay, Sujith(1-RTG) Dreidel lasts O(n2) spins. (English summary) Adv. in Appl. Math. 36 (2006), no. 1, 85–94 The list of references is also worth checking as it has some more elementary accounts.
Margaret Friedland
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