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Did you solve it?

We talk to three teachers, working in different countries

Discover the meaning of the coloured squares on the cover of issue 13

Introducing the work that has won mathematics' most famous award

Tuesday 11 October, 7.15pm. Come along! Featuring hundreds of free copies of Chalkdust, free pizza, and the chance to purchase a Chalkdust T-shirt.

Print out and make a flexagon