Courtesy of Ashley Marshall, who has an excellent piece on MiLB.com about park and league environments at the major- and minor-league levels, comes this graph, which compares run-scoring levels for ...

If true, the following conjecture of Thomassen [Th81] is a planarity criterion for a special class of graphs that involves only K 5. Recall that a planar graph on n vertices contains at most 3n-6 ...