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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
Review of The Element in the Room
Reviewing this week's conundrum prize... science-y stuff staring you in the face!
Dispersion on the dark side of the moon
Maths has strong connections to art and music, but what about to both at the same time?
The Buckingham π theorem and the atomic bomb
Diego Carranza tells you to stop worrying and dimensionally analyse the bomb