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
Do the shuffle: finding π in your playlists
Henry Jaspars really likes Nick and Norah’s infinite playlist.
Christmas conundrum #3
Try our nonograms! And remember, not all puzzles have a unique solution...
My mathematical trajectory
Stories and lessons on diversity in mathematics from a globe-trotting number theorist.
