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The two ways down shown on a Hasse diagram

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
A Ring of Cats and Dogs
We review the first of this year’s nominees for the Book of the Year
What’s hot and what’s not, Issue 15
Fashion is fleeting, Chalkdust regulars are not.
Playing billiards with cue-bics
Yuliya Nesterova misses all the pockets, but does manage to solve some cubics
Review: Power in numbers — the rebel women of mathematics
Celebrate International Women's day by reading about rebel women in mathematics!