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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.

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
Page 3 model: Woollen jumpers
How did your favourite sweater become so big? And how big can it get?
On curvature: cars, clothoids and cartography
Issah Merchant discusses the geometric principles behind, and real-world applications of, curvature
The mathematics of human migration
Human migration with mathematical models, data and a hands-on experiment!
The doodle theorem, and beyond…
Colin Wright juggles Euler, doodling and Millennium problems