More from Chalkdust

Dear Dirichlet, Issue 23
Travel, trade and Tony Blackburn pepper the prof's postbag this issue
The hidden harmonies of Hamming distance
Chris Boucher explores the secrets and symmetries behind a measure of the distance between binary strings
How Polish cryptographers first broke the unbreakable cipher
Kimi Chen deciphers the 1920s story you haven’t heard
Chalkdust Book of the Year 2019
We reveal the shortlist
The phantom parabola
Zoe Griffiths investigates paranormal quadratics
New largest prime number discovered!
Amaze your friends with our top facts about the new largest known prime number
