More from Chalkdust
Making a Möbius strip
Sophie Bleau chops up, unravels, and squeezes the torus into shape
In conversation with Dominique Sleet
Ellen Jolley learns how to run a maths outreach programme
Christmas puzzle #2: A Christmas nonogram
Puzzle #2 in our 2020 Christmas puzzle series
Page 3 model: Bees
You won't bee-lieve it
Top Ten: Chalkdust regulars
The definitive chart of the best Chalkdust regulars
Can we do good more effectively?
Choosing which charity we donate money to shouldn't be an entirely emotional decision.