More from Chalkdust
Notched edge cards
Joe Celko makes a database from card and knitting needlesDo the shuffle: finding π in your playlists
Henry Jaspars really likes Nick and Norah’s infinite playlist.When Truchet met Chladni
Stephen Muirhead meets neither, as he explores waves, tiles and percolation theoryPage 3 model: Ponytails
Many mysteries about hair are now revealed with the ponytail shape equationIn conversation with Cédric Villani
We feel underdressed for Breakfast at Villani'sWhy I hate an empty bus stop
How the queue size tells you when the next bus is coming