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The Irrational Diary of Clara Valentine
We review the fifth of this year’s nominees for the Book of the YearChalkdust issue 11 puzzle hunt #3
David Sheard sets the third puzzle. Can you solve it?Christmas competition #1: ‘You can’t polish a nerd’
Win a DVD boxset from Festival of the spoken nerd in our first Christmas competition!Topological tic-tac-toe
Alex Bolton plays noughts and crosses on unusual surfacesFolding nets into Johnson solids
How does one produce a net for the broadest class of polyhedra?Top Ten vote: Colours of chalk
Vote for your favourite colour of chalk for Issue 04: is it white, yellow, or the Post Office Tower?