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

Coffee problems
Patrick Hedfeld has bean there, modelled that
Oπnions: In defence of toy models
Calum gets on his soap box about toy models
Ferm-ant’s principle
Tyler Helmuth has lost his ant-vocado
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
How to tile a chessboard
Introducing polyominoes
