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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
The maths of Mafia
Sophie explores the fascinating mathematics behind the games Mafia and Among Us.
The Buckingham π theorem and the atomic bomb
Diego Carranza tells you to stop worrying and dimensionally analyse the bomb
Why is it so hard to pull two phone books apart?
Take two phone books and interleave all their pages one by one. Now try and pull them apart by their spines. Impossible, right?