More from Chalkdust
Cryptic crossnumber (including hints)
Looking for a challenge? Try our cryptic crossnumber—with hints and tips so anyone can have a go!
Too good to be Truchet
Colin Beveridge looks at different designs for 2- and 3-dimensional tiles
Should you buy a Valentine’s day present?
For those of you tackling this dilemma, here's your answer...
Binary magic card trick
Behind today's door... A binary magic card trick!
Killing by numbers: the mathematics of warfare
A blast from the past. Modelling battle grounds from ancient Greece.
A counterintuitive result in the theory of traffic flow
Additional roads do not imply faster travel times!