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
Short Cuts: Maths
We review the sixth of this year's nominees for Book of the Year
Page 3 model: Ponytails
Many mysteries about hair are now revealed with the ponytail shape equation
Cracking the Guess Who? board game
Maths and Decision Theory to be the best at playing Guess Who?
