More from Chalkdust
Notched edge cards
Joe Celko makes a database from card and knitting needles
Crossnumber winners, issue 12
Did you solve it?
Flo-maps fractograms: the game
Try out these flo-maps for yourself: fractions speak louder than words
Page 3 model: Ponytails
Many mysteries about hair are now revealed with the ponytail shape equation
Surname extinction
Why do surnames die out? We take a look at the Galton-Watson process for modelling the extinction of surnames to answer the question: 'When will we all be Smiths?'
How to make: Platonic solids from tube maps
Impress your friends! As presented in our Talkdust show.