More from Chalkdust
Read Issue 21 now!
Sudoku, potatoes and crossnumber's biggest secrets finally revealed in our spring 2025 issue. Plus all your favourite columns!
Top Ten: Matrices
The definitive chart of the best matrices
A Compendium of Mathematical Methods
We review the second of this year's nominees for the Book of the Year
The scutoid: a geometric building block of life
In 2018, scientists discovered a new shape that is essential to multicellular life
Winning the Chalkdust coin game
How to win a game when your expected score is 0
Can we do good more effectively?
Choosing which charity we donate money to shouldn't be an entirely emotional decision.