Linkage

• Marble machine with 11000 marbles (video)

• Pros and cons of standardized testing, only slightly exaggerated

• Conservation of genki in Critters (G+)

• Bruce Shapiro's sand drawing machines

• The mystery of a partial impact factor or, yet another reason not to take these numbers seriously

• Scott Walker looks to kill tenure in Wisconsin (G+)

• Can you prove it? A cute theorem about a coincidence of line segments connecting centers of tangent circles (G+)

• Numberphile video on Ford circles and mediants (G+)

• Even a Nobel prize won't save you if you say something sexist enough (G+)

• Video of a cat playing a theremin (G+)

• Playing cards decorated with mathematics

• Congress's attack on the geosciences

• Manifesto of editorial independence gets editors sacked from for-profit open source publisher

• Economists rank themselves (G+)

• The new open-source SoCG proceedings are here

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