More from Chalkdust
- David Sheard sets the third puzzle. Can you solve it?
- Some saucy modelling
- David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
- How optimising the space around a circular monument is related to supereggs
- Take two phone books and interleave all their pages one by one. Now try and pull them apart by their spines. Impossible, right?