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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.

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 Irrational Diary of Clara Valentine
We review the fifth of this year’s nominees for the Book of the Year
Crossnumber winners, issue 09
Did you solve it?
The croissant equation
Each time you eat a croissant you might be biting more than 500 layers of dough!
Should you buy a Valentine’s day present?
For those of you tackling this dilemma, here's your answer...