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.
More from Chalkdust

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
Page 3 model: Woollen jumpers
How did your favourite sweater become so big? And how big can it get?
Overturned polygons: shapes with less than two sides
Hugh Duncan explores polygons with a shortage of edges
Dear Dirichlet Christmas special
Agony uncle Professor Dirichlet answers your personal problems this Christmastime.
