More from Chalkdust

A day in the life: teachers
We talk to three teachers, working in different countries
Penguins: the emperors of fluid dynamics
Sam Harris looks at how Pingu and his friends can stay cosy
The power of curly brackets
Mats Vermeeren sketches a simple proof of Noether's first theorem
Christmas conundrum #1
Solve this and you could be the lucky winner of a Chalkdust T-shirt
The Housekeeper and the Professor
Memory and maths in the modern world
Interstellar travel: the mathematics of wormholes
Matthew Wright looks at wormholes in sci-fi
