David Colquhoun and Rafael wearing t-shirts, and a close-up of the t-shirt
More from Chalkdust
Dear Dirichlet, Issue 22
Rhythm, rivers and rises pollute the prof's postbag this issue
NEW! Pop-math book club
Do you have lots of unread pop math books on your shelves? Join our new monthly online book club!
Things to make
Platonic shapes from tube maps, flexagons, and more mathematical craft
What’s hot and what’s not
Optimal Pac-Man
Ghostbusting with graph theory
Reinventing 2D
What a difference a matrix makes