This post was part of the Chalkdust 2016 Advent Calendar.
Today is the final day of the Chalkdust advent calendar.
More from Chalkdust
- Now available to catch up on YouTube
- Independent Sage's Christina Pagel, hyperbolic mindfulness and make-your-own Markov tweet feature in our latest edition. Plus all your favourite puzzles & columns.
- Books, business and barns are the topics readers have sent in to the professor's postbox this issue
- £100 of MathsGear goodies to be won if you can solve it
- A handy tool that can make writing great tweets much easier
- Fashion is fleeting, Chalkdust regulars are not.