img15 - Chalkdust

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.

Crossnumber winners, Issues 18 & 19
Did you solve it?
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
Overturned polygons: shapes with less than two sides
Hugh Duncan explores polygons with a shortage of edges
In conversation with Marcus du Sautoy
We chat to Marcus about science communication, teaching mathematics in schools, and how to make group theory sound sexy.
Killing by numbers: the mathematics of warfare
A blast from the past. Modelling battle grounds from ancient Greece.