More from Chalkdust
Orbit crossnumber
Can you solve it?
Chalkdust issue 10 – Coming 24 October
Come along to our launch party for free pizza and the real quiz
When Truchet met Chladni
Stephen Muirhead meets neither, as he explores waves, tiles and percolation theory
Binary magic card trick
Behind today's door... A binary magic card trick!
Switching sides in a matrix equation
Looking for a neat description of this useful matrix part-inverse
What’s your favourite number?
Favourite numbers for many are linked to birthdays or anniversaries, but here is our take on the question