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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
Dear Dirichlet, Issue 19
Game shows, flight and social media bots are among the problems solved in this issue's Dear Dirichlet agony aunt column
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
An uncomfortable truth
Lucy Rycroft-Smith and Darren Macey unpick the legacy of some of the most ubiquitous names in statistics
Interstellar travel
Investigate the mathematics of wormholes

More from Chalkdust

Oπnions: In defence of toy models

Dear Dirichlet, Issue 19

Cryptic wordsearch, Issue 19

On the cover: skyrmions

An uncomfortable truth

Interstellar travel