More from Chalkdust
In conversation with Martin Hairer
We talk to the Fields medallist about his life, his work and his advice to his younger self.
Bells, braids and taxicabs
An adventure that starts with a morning of bell ringing and ends with a mad dash in a taxi
Superegg
How optimising the space around a circular monument is related to supereggs
Stopping distances in the Highway Code are wrong
An easy equation to remember for your driving theory test, with dangerous consequences
In conversation with Ian Stewart
We speak to one of Britain's most successful popularisers of maths
What’s your favourite number?
Favourite numbers for many are linked to birthdays or anniversaries, but here is our take on the question