Linkage
- The Tutte–Coxeter graph and its construction from the outer automorphisms of \( S_6 \) 
- Question: how many arXiv papers are updated to their final journal versions? (Answer: about half of them have non-empty journal-reference metadata; G+) 
- Keleti's conjecture on the ratio of perimeter to area of a union of unit squares (G+) 
- Reference for mixed graph acyclicity testing? (Still not adequately answered, but the bounty has since expired) 
- Six-tetrahedron kaleidocycles don't work (but it takes a computer simulation to demonstrate it, because paper ones do; G+) 
- The new single-divisible-vote last-place-elimination scheme for Hugo nominations (or as they call it, e pluribus Hugo; G+) 
- Wikipedia blocked in Russia over its refusal to take down information about illegal drugs (since unblocked) 
- Six points in general position in 3d can be partitioned into triples determining two linked circles 
- Boulet imagines what physicists in a pixelated world might think of it 
- Just because a formula looks mathy doesn't mean it makes any sense 
- Google teaches spammers how to break security to get their ads through 
- Constructing the Golay error-correcting code from a great dodecahedron (G+)