Ben Walker, Adam Townsend & Andrew Krause invite you to play with their fun online PDE visualiser
Books, business and barns are the topics readers have sent in to the professor's postbox this issue
In 2018, scientists discovered a new shape that is essential to multicellular life
Stephen Muirhead meets neither, as he explores waves, tiles and percolation theory
It's the last day of the Chalkdust advent calendar, so there must be something very good behind today's door...
The geometry of psychedelic hallucinations
