More from Chalkdust
The big argument: What’s the best way to end a proof?
QED or $\square$?
Chalkdust issue 10 – Coming 24 October
Come along to our launch party for free pizza and the real quiz
Crossnumber winners, issue 09
Did you solve it?
Topological tic-tac-toe
Alex Bolton plays noughts and crosses on unusual surfaces
Christmas conundrum #3
Try our nonograms! And remember, not all puzzles have a unique solution...
In conversation with Bernard Silverman
We chat to the chief scientific advisor to the Home Office about the role of scientists and mathematicians in politics