This post was part of the Chalkdust 2016 Advent Calendar.
Today is the final day of the Chalkdust advent calendar.
More from Chalkdust
- Squid Game, hidden harmonies and DnD coming your way in our brand new issue! Plus all your favourite puzzles & columns.
- Win a £100 Maths Gear goody bag by solving our infamous puzzle
- Weddings, holidays and catfish find their way into the prof's postbox this issue.
- Can you solve it?
- Are you β? Are you γ?
- We announce the winner of this coveted prize