More from Chalkdust
Penguins: the emperors of fluid dynamics
Sam Harris looks at how Pingu and his friends can stay cosySignificant figures: Gladys West
Madeleine Hall looks at one of the minds behind GPSGeometry Juniors
We review the second of this year's nominees for the Book of the YearChristmas puzzle #3: Colouring by numbers
Puzzle #3 in our 2020 Christmas puzzle seriesBook of the Year 2019
We announce the winner of this coveted prizeSolutions to recent puzzles
Looking back at puzzles about complex numbers, tic-tac-toe, and the Eggnog Mystery