This post was part of the Chalkdust 2016 Advent Calendar.
Today is the final day of the Chalkdust advent calendar.
More from Chalkdust
- Celebrate the latest issue with us in London on 28 November
- Fields medals, iconic intersections, and things with silly names coming your way in our brand new issue! Plus all your favourite puzzles & columns.
- Find out by answering six simple questions
- Follow these simple steps to frustrate anyone who ever dreamed of using their light saber on the USS Enterprise
- Have your say
- The definitive chart of the best matrices