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
Correction: Who is the best England manager?
Paddy provides a much anticipated update to the most important use of statistical analysis in the last two years
Geometry Puzzles in Felt Tip
We review the first of this year's nominees for the Book of the Year
100 years with the Sierpinski triangle
Three ways to obtain and generalise a beautiful fractal
