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
The power of curly brackets
Mats Vermeeren sketches a simple proof of Noether's first theorem
Piet Hein: the pirate
Did the Danish mathematician also sail the high seas?
Christmas puzzles
Something for you to solve during the post-Christmas lull
