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Topological tic-tac-toe
Alex Bolton plays noughts and crosses on unusual surfaces
What’s hot and what’s not, issue 08
Fashion is fleeting, Chalkdust regulars are not.
Crossnumbers and cross products
A crossnumber clue takes us plunging headfirst towards projective geometry
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Make calculations easy with this simple-to-make slide rule
Christmas cracker joke II
This post was part of the Chalkdust 2016 Advent Calendar. Newton: "Are you going to the Fibonacci themed Christmas party?" Euler: "Yes! I heard it's going to be as big as the two previous years put together."