img6 - Chalkdust

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 13
£100 of Maths Gear goodies to be won if you can solve it
How to Make the World Add Up
We review the third of this year's nominees for the Book of the Year
Overturned polygons: shapes with less than two sides
Hugh Duncan explores polygons with a shortage of edges