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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
Dear Dirichlet, Issue 09
Coffee, Brexit and badgers are among the topics of discussion in this issue's Dear Dirichlet advice column
You can count on Dirichlet
Counting the divisors of an integer turns out to be a rather hard problem
Can you solve these puzzles?
While we work on issue 2

More from Chalkdust

Oπnions: In defence of toy models

Cryptic wordsearch, Issue 19

On the cover: skyrmions

Dear Dirichlet, Issue 09

You can count on Dirichlet

Can you solve these puzzles?