More from Chalkdust
In conversation with Martin HairerWe talk to the Fields medallist about his life, his work and his advice to his younger self.
How to make: Ecki the polytopeMake your own Ecki
The scutoid: a geometric building block of lifeIn 2018, scientists discovered a new shape that is essential to multicellular life
Solutions to recent puzzlesLooking back at puzzles about complex numbers, tic-tac-toe, and the Eggnog Mystery
Time turns backwards at the Spark FestivalThe extreme weirdness of slow viscous flows, and why borrowers shouldn't use doggy paddle.
Music playlists, Facebook and TwitterHere is a very exciting way to measure how similar is your music playlist between your friends, or how similar are your Facebook contacts.