More from Chalkdust
- David Sheard sets the third puzzle. Can you solve it?
- David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
- Blaise Pascal was driven to begin the mechanisation of mathematics by his father's struggles with an accounts book in 17th century France.
- When slide rules used to rule... find out why they still do
- Can you solve it?