More from Chalkdust

In conversation with Shannon Trust
We find out more about the charity's work to support maths education in prisons.
On √2
Yiannis Petridis connects square roots and continued fractions
Topological tic-tac-toe
Alex Bolton plays noughts and crosses on unusual surfaces
Heads and Tails
An unexpected way to beat the odds in this classic game
Machine learning 101
Start your quest to conquer the planet with this introduction to the wonderful world of machine learning
Stopping distances in the Highway Code are wrong
An easy equation to remember for your driving theory test, with dangerous consequences
