Linkage
Reversible cellular automaton, newly listed as a Wikipedia "Good Article" (G+)
André Schulz's report from GD 2015, all the GD presentation slides, and Pat Morin's contest-winning freshman research project (G+)
Lior Pachter's unsolved problems supplementing the Common Core (MF; G+)
Global coalition tells Facebook to kill its Real Names policy
The 120-cell and its decomposition into 12 rings of 10 dodecahedra