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
Making your own papercupter
Next time you are finished using a paper cup, create your own papercupter!
Why self-service machines give such awful change
Unexpected item in bagging areAAAARGGGHH here's 90p change in pennies
Can you solve these puzzles?
While we work on issue 2
