Linkage for Wikipedia's 15th birthday

A great long-form new year's resolution to slim down your website (MF)

A guide to scholarly literature on online harassment and responses to it (G+)

The free modular lattice and its resemblance to the free distributive lattice (G+)

Escher's Stars

Nerode prize in multivariate algorithmics, call for nominations

Cutting pizza into congruent pieces that don't all meet at the center (arXiv)

Clear video explanation of the halting problem (G+)

Challenge: draw these exploded polytopes automatically as nicely as Vi Hart did by hand (G+)

Student evaluations better at measuring gender bias than teaching effectiveness (MF; G+)

Co-authorship helps male but not female academics get ahead

Part of a series of nice visualizations of Möbius transformations (G+)

Gerrymandering explained and some computational experiments in using k-medians to avoid it (G+)

The most-edited Wikipedia pages over the last 15 years