More from Chalkdust
The problem with addition
It doesn’t add up for Patrick CreaghPage 3 model: Cows
How big is the biggest cow?Top ten vote issue 11
Vote for your favourite maths-themed day outBinary magic card trick
Behind today's door... A binary magic card trick!Hairy balls, cyclones and computer graphics
What can a 100-year-old result in topology say about weather and computers?Fun with water bells
Explaining how surface tension makes water form surprising shapes