img10 - Chalkdust

Rubeus Hair-grit: it’s helpful to assume that hairs grow in a grid pattern with 1mm gaps between hairs. That’s a gap of around 13 hair-widths, so only 1 out of 196 `hair spaces’ are filled.

Calum Ross

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?
What’s hot and what’s not, Issue 19
Fashion is fleeting, Chalkdust regulars are not.
On the cover: skyrmions
Sven Bjarke Gudnason and Calum Ross introduce you to the wonderful world of skyrmions
Dear Dirichlet, Issue 11
Grant applications, musical media and last-minute Olympics training are the topics readers have sent in to the professor's postbox this issue
Kepler’s barrels
Sam Hartburn orders wine by the barrel, but wonders if she's getting the most wine

More from Chalkdust

Oπnions: In defence of toy models

Cryptic wordsearch, Issue 19

What’s hot and what’s not, Issue 19

On the cover: skyrmions

Dear Dirichlet, Issue 11

Kepler’s barrels