More from Chalkdust
A symmetric universe
Sam Kay reflects on building a universe
Automated joke generation
I like my towns like I like my Alex: Bolton
Beghilos
When you get tired of using your calculator for numbers, why not use it for words?
Cardioids in coffee cups
Staring at your coffee, you wonder whether the light reflecting in cup really is a cardioid curve...
In conversation with Ian Stewart
We speak to one of Britain's most successful popularisers of maths
Introducing the Cuboku
Can you solve our 3D Sudoku puzzles?