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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.

Dear Dirichlet, Issue 21
Suits, sofas and sculptures punctuate the prof's postbag this issue
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
Secrets, surveys and statistics
Paula Rowińska uses mathematics to answer some awkward questions
Advent puzzles I
Behind the second door of the advent calendar, there is a puzzle

More from Chalkdust

Dear Dirichlet, Issue 21

Oπnions: In defence of toy models

Cryptic wordsearch, Issue 19

On the cover: skyrmions

Secrets, surveys and statistics

Advent puzzles I