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In this month's episode of Wrong, But Useful, we talk to @AJMagicMessage, who is Andrew Jeffrey in real life, and one of the driving forces behind Maths Week England, which in 2019 is November 11th to 15th.

*Apologies for a few issues with feedback in this episode. Dave takes full responsibility.*

We discuss:

**Number of the Podcast**: 1089
- How to get involved in Maths Week England
- Game Theory (especially isomorphic games) and ncase.me/trust (via @LorHRL Hannah)
- Reading: @benorlin’s Math[s] with Bad Drawings and @robeastaway’s Maths on the Back of an Envelope.
- Via @robeastaway: further thoughts on rounding
- Via @peterrowlett: problem-solving in the new A-level
- Should you tie your shoes on the travelator, or on a standard walkway?
**Shorts**:
- Big MathsJam bookings
- Via @octonion (Christopher D Long): "I'm also curious if Haken and Appel's original computer code for the Four Color Theorem from 1972 is still available, and if it can be run on modern hardware. It'd be a sadly missed opportunity for scientific history if it were somehow lost."
- Carnival of mathematics 175
- Election coming up. We want to see your bad graphs!

**Puzzle feedback**: Late solution to the square-colouring puzzle, from Sam Steele, our favourite Antipodean listener in Carrum Downs, Australia. No answers to the pillar problem yet.
**New puzzle**: (via @cshearer41) Find the sum of the infinite series $\frac{1}{2} + \frac{1}{4} + \frac{2}{8} + \frac{3}{16} + \frac{5}{32} + \frac{8}{64} + \frac{13}{128} + \dots$ (i.e. Fibonacci on the top and powers of 2 on the bottom).

Next month is the Big MathsJam special!

* Edited 2019-11-08 to fix LaTeX

## Colin

Colin is a Weymouth maths tutor, author of several Maths For Dummies books and A-level maths guides. He started Flying Colours Maths in 2008.
He lives with an espresso pot and nothing to prove.