Update 1 May 2021
We have some exciting new Chalkdust T-shirts on the way, available to readers by mid-May.
More from Chalkdust
Read Issue 20 now!
Spirographs, complex triangles and a lot of ants feature in our AW24 issue! Plus all your favourite puzzles & columns.
Cryptic crossword, Issue 20
Can you solve it?
A mathematician’s guide to Edinburgh
Stranded in Scotland's capital? This guide will keep you busy
Dear Dirichlet, Issue 20
Cricket, coursework and karaoke are among the problems solved in this issue's Dear Dirichlet agony aunt column
Prize crossnumber, Issue 20
Can you solve it?
Top ten: top tens
The undisputed top ten top tens this season