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Chalkdust issue 11 puzzle hunt #3David Sheard sets the third puzzle. Can you solve it?
On the cover: Apollonian packingDavid Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
Issue 06Cardioids in coffee cups, counting with three fingers, and breakfast at Villani's. Plus the return of all your favourite fun pages in our autumn 2017 issue.