More from Chalkdust
How to cheat at cards
Kevin Houston teaches us how to deal ourselves the best handSpotlight on: Pamela Harris
Pamela E Harris's story, as told by Talithia WilliamsChalkdust’s Christmas conundrums
As the festive season strikes again, we'll be dishing out more fiendish puzzles – this time with prizes!Why maps are wrong
If only the Earth were flat...Fun with water bells
Explaining how surface tension makes water form surprising shapesOptimal Pac-Man
Ghostbusting with graph theory