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The two ways down a triangle.

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.

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
Prize crossnumber, Issue 15
Win a £100 Maths Gear goody bag by solving our infamous puzzle
Taking the (mathematically) perfect picture at the Leaning Tower Of Pisa
Finding the best picture at the Leaning Tower of Pisa is all about the maths rather than the pose!
In conversation with Hannah Fry
On the mathematics of love, communicating maths to the public, and women in maths.