More from Chalkdust
- David Sheard sets the third puzzle. Can you solve it?
- Like Fibonacci, but weird. Robert J Low and Thierry Platini explain
- David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
- More sartorial inquisition for your feet
- 20 questions, the axiom of choice and colouring sequences.