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Calum is a lecturer in physics at Edge Hill University where he studies topological solitons and enjoys talking about maths and physics to anyone who will listen. He can often be found on the side of a mountain or out on a bike, talking to himself about solitons.

Oπnions: In defence of toy models
Calum gets on his soap box about toy models
Cryptic wordsearch, Issue 19
Can you solve it?
On the cover: skyrmions
Sven Bjarke Gudnason and Calum Ross introduce you to the wonderful world of skyrmions
Chalkdust Book of the Year 2022
We announce the shortlist of our favourite maths-themed books of last year
Page 3 model: Woollen jumpers
How did your favourite sweater become so big? And how big can it get?
Integration: It’s more than the sum of its parts
Defining what exactly an integral is leads naturally to an explanation of how to handle approximating them.