A knight to remember
More from Chalkdust
Dear Dirichlet, Issue 12
Books, business and barns are the topics readers have sent in to the professor's postbox this issue
When Truchet met Chladni
Stephen Muirhead meets neither, as he explores waves, tiles and percolation theory
Mathematics for the three-fingered mathematician
Robert J Low flips one upside down.
Between a square rock and a hard pentagon: fractional polygons
A polygon with four and a half sides?!
Crossnumber winners
Are you a winner?
Music playlists, Facebook and Twitter
Here is a very exciting way to measure how similar is your music playlist between your friends, or how similar are your Facebook contacts.