More from Chalkdust
- Lucy Rycroft-Smith and Darren Macey unpick the legacy of some of the most ubiquitous names in statistics
- The definitive chart of the best day trips
- The definitive chart of the best units
- The Chalkdust team set you a challenge, for which the prize is a £25 Amazon voucher...
- Print out and make a flexagon
- Robert Smith? tells us how his favourite matrix saves lives