More from Chalkdust
Prize crossnumber, Issue 15Win a £100 Maths Gear goody bag by solving our infamous puzzle
Top ten vote issue 12Have your say
Christmas lights, trees and mathsWhy do Christmas lights get tangled? And what's the perfect way to decorate a Christmas tree? Find the answers here.
Linear algebra… with diagramsRediscover linear algebra by playing with circuit diagrams
Top Ten: Parts of a circleThe definitive chart of the circle's greatest parts
In conversation with Artur AvilaChatting with a Fields Medallist in a Leicester Square pub