More from Chalkdust

Easy to state, hard to prove: The Collatz conjecture
90 years later, we're still unable to prove this surprisingly simple statement
Top Ten: Units of measurement
The definitive chart of the best units
Baking a Menger sponge sponge
Sam Hartburn bakes your favourite fractal
Issue 06
Cardioids in coffee cups, counting with three fingers, and breakfast at Villani's. Plus the return of all your favourite fun pages in our autumn 2017 issue.
Puzzles, Issue 04
Solve the puzzles that appeared in Issue 04.
Klaus Roth
(1925 - 2015)
