Linkage for Halloween

Jörg Arndt's library and book of bit-manipulation programming techniques (G+)

The geometric median of a solid triangle, another triangle center whose lack of closed form is keeping it out of ETC

Rigid-origami variable-capacity measuring spoon (G+)

"Easily the largest road-distance TSP that has been solved to date", a pub-crawl with 24727 stops (G+)

High performance Java implementation of a Cuckoo filter

OMICS conference accepts a paper written by autocomplete (G+)

Matt Parker makes mathematical sculpture from office supplies

The Rule 90 cellular automaton on Wikipedia

3d objects that look like Escher's impossible objects

Dual graph on Wikipedia (G+)

ArXiv uses Turnitin to detect plagiarized submissions; Turnitin gains access to arXiv content to detect plagiarism elsewhere (G+)

Using the Strahler number to visualize watersheds (G+)

The many women in computing who have been the the first X, no qualifier (G+)

Five easy-to-state but hard-to-solve problems in mathematics

Symmetries of the permutohedron (G+)