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]]>- @samuel_hansen's antiracism post((get well soon, Samuel)). Dave and I both assert that Black Lives Matter and acknowledge that we have a significant amount of work to do to create a just society.
- In a whiplash-inducing change of tone, tooth fairy maths
- Multiplayer Nim (‘unlucky 10’)
- The Million Game from @drewfoster
- Dave seems to have a thing about noughts and crosses
- The Mathoff is over: thanks, everyone!
- Now, more than ever, would a decent text book be the answer?
- The chaos game in a hexagon
- Social distancing in 3D
- Via @christianp: Simon Plouffe has found a sequence of 565 primes in 'geometric progression' (meaning they're the closest integers to the first 565 terms of a geometric sequence)
- Some quotes from past blog posts:
- Dave insults mechanics, then gets stroppy about Colin insulting stats
- In this month's podcast, @reflectivemaths and I discuss: Colin's book being available to buy
- Colin gloats about Spoof My Proof and Dave chews on sour grapes
- Colin has laser eye surgery and doesn't care about Dave's health... ... but does care about 20481

- A final puzzle: It usually takes me eighty minutes to run my Sunday running route, but if I wear my running hat, it takes one hour and twenty minutes. Why?

Thank you for listening loyally, especially to those who've co-hosted and interacted with us. It's been an entertaining journey.

Right. How do we get into pretending this didn't happen?

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]]>The post Wrong, But Useful: Episode 79 appeared first on Flying Colours Maths.

]]>- A scoring system for an online quiz round.
- The Big Mathoff
- What is a surd?
- Currently reading Ratio by Michael Ruhlman - a cookery book that starts from the principles
- Some Noughts and Crosses variants
- Core maths festival
- (via @mathsTechnology/Tom Button) For any given cubic if a line intersects it at three points then the sum of the x-coordinates of these points will be constant.
- An infinite monkey music bot
- A fractal
- Odds and Evenings and Mathematical Objects
- Ending the podcast

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]]>The post Wrong, But Useful: Episode 78 appeared first on Flying Colours Maths.

]]>This month, we discuss:

- Clarissa's Artful maths books, available via Tarquin - the activity book and the teacher's guide
- Number of the podcast: $\phi$ (and 3D maths)
- @anniek_p's #mathartchallenge
- Aperiodical’s big math-off is live! Also the stickerbook
- Rabbits and elephants
- Super-rectangles
- (via Peter Rowlett): Maths to get you through lockdown
- COVID-19 and Bayes's theorem
- Supermarket 2m distancing/route planning
- Richard Guy (103 1/2) and John Conway (82) have died.
- Casio calculator emulators now free
- Probability Question from an American Maths challenge
- (via Peter Rowlett) ABC conjecture proof to be published
- (via Peter Rowlett): Podcast roundup
- The final few episodes of Wrong, But Useful. After some discussion, we've decided that Episode 80 will be the last WBU, although we hope someone else will pick up the topical maths podcast baton.

* Edited 2020-04-19 to add show notes.

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]]>The post Wrong, But Useful: Episode 77 appeared first on Flying Colours Maths.

]]>- Negative primes
- Surdoku (look in issue $2^5$)
- Chris's dark past
- Chalkdust book of the year
- Book (or writing) ideas (I’m trying to compile a big list of maths things I - or anyone - could write about. If you have such an idea, let me know and I’ll stick it on the list.)
- Chris's Pi Day antics
- Katherine Johnson has died, aged 101
- A COVID-19 lesson plan and dataviz.
- Distance-time graphs

* Edited 2020-03-14: To subscribe to Chris's maths newsletter, email him on aap03102 [at] gmail.com and ask nicely!

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]]>The post Wrong, but Useful: Episode 76b appeared first on Flying Colours Maths.

]]>The post Wrong, But Useful: Episode 76 appeared first on Flying Colours Maths.

]]>We discuss:

- sunrise (posts by @colinthemathmo and by me got the same answer, someone else disagrees, nice thing to explore)
- favourite numbers
- a lovely post by @samhartburn about tetrahedra fitting through each other
- bridges (why are the bricks not parallel with the road?)
- The R0 value of the coronavirus
- Internet once again astonished that multiplication commutes
- Perfect espresso formula
- In communicate the bloody thing properly news:
- via @peterrowlett: 30 A*s in one class
- via @peterrowlett: Funding boost
- via @peterrowlett: call for hosts for Carnival of mathematics
- via @evelynjlamb: Google ngrams shows a dramatic spike for ‘enneagons’ (and other-gons) around 1820. Why?

Watch out for a special mini-episode next week!

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]]>The post Wrong, but Useful: Episode 75 appeared first on Flying Colours Maths.

]]>In episode 75 of Wrong, but Useful, we talk with @astrastefania, who is Stefania Delprete in real life. We discuss:

- Dreams about Maths and doing Maths in lucid dreams
- Goodreads maths reading challenge
- Newsletters I like: Stuff Evelyn Wants You To Read by @evelynjlamb and and Fair Warning by @SophieWarnes
- Is a parallelogram a trapezium? (via @cshearer41)
- via @jamesgrime: The bullseye illusion
- RI Christmas lectures with @fryrsquared
- How do you describe Confidence Intervals? How damaging is to say “I’m 95% sure that mu is between ‘here’ and ‘here’ “? We reference The Maths of Life and Death.
- via @MrShepherd Maths (Lee Shepherd): "This may be a really stupid one but please enlighten me as I've been thinking for a few weeks to work it out. If irrational numbers are infinitely long, does pi contain the value e in its decimal? Do they converge at some point?"
- via @johndcook: A simple unsolved problem: Are there infinitely many positive integers n such that $\tan(n) > n$?
- via @wtgowers: Pretty accessible explanation of how to solve a cubic
- Via Adam Atkinson: how much would a suitcase of gold weigh?
- Pizza Hut’s 41% off food in January
- Drawing a perfect circle
- Questions I wasn’t expecting … When you’re numbering a list for a random sample, do you number across or down? and … Why isn’t stabbing my pen into the page ‘random’?
- What can I do with a pricing gun?
- Where did Lagrange come from?

* Edited 2020-01-17 to correct @fryrsquared's Twitter handle. Thanks to @peterrowlett.

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]]>The post Wrong, But Useful, Episode 74 appeared first on Flying Colours Maths.

]]>- @stecks (Katie Steckles): Brouwer’s Fixed Point Theorem: “they said it’s a theorem, so I’ve got to believe it.” Mentions @jamesgrime.
- @christianp (Christian Lawson-Perfect): ordering cards to generate a fractal sequence.
- @peterrowlett (Peter Rowlett): transforming numbers problems into graphs. Mentions @alexcorner and @wtgowers. The puzzle is stated here and the discussion thread is here.
- @dragon_dodo (Dominika Vasilkova): the Weierstrass function
- @scroggs (Matthew Scroggs): @oddsandevens’s fractional origami.
- Yuen Ng: Miscancelling fractions
- @pecnut (Adam Townsend): @astrastefania’s redesign of the the musical stave.
- @smokeyfurby and his handler (Belgin) enjoyed @samhartburn’s cake, based on @becky_k_warren’s Big Math-Off entry - scroll down!
- @njj4 (Nicholas Jackson): A bit about Émilie du Châtelet.
- Adam Atkinson: On randomly-moving knights.

* edited 2019-12-08 to add links.

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]]>The post Wrong, But Useful, Episode 73 appeared first on Flying Colours Maths.

]]>*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

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]]>The post Wrong, But Useful: Episode 72 appeared first on Flying Colours Maths.

]]>**Number of the Podcast**: 179 (balloons)- Maths Week England is mid-November (11-16th). Catherine is involved in running a contest for it!
- Via Peter Rowlett: Women’s names
- Via Adam Atkinson: rounding
*up*or rounding*away from zero*or rounding*to even*? - Reading books: we're all getting our teeth into Rob Eastaway's Maths On The Back Of An Envelope and Kit Yates's Maths Of Life And Death. Cat is also reading Invisible Women by Caroline Criado Perez.
- The Pink Tax
- How much does nursery cost?
- A jury awarded damages of \$8 billion against Johnson and Johnson - as Rob Eastaway says, enough that the victim could budget \$300,000 a day if he lives to be 100.
**Shorts**:- New Chalkdust out now
- Sums of cubes news: they found 3 between recording and going live!
- George Osborn
- Crinkle Crankle walls
- Perfect circle drawing
- Words from obsolete technologies (inspired by clockwise/anticlockwise)

**Puzzle feedback from last time**:- We missed a lovely answer to the probability machine puzzle from @chrishazell72, who worked the ratio out at about 55-45.
- Gold star for Adam Atkinson who said he’d expect 100/e, about 37 squares not to be coloured in. (I think I’ve missed some other stars in my mentions.)

**New Puzzle**(via @davidKButlerUoA): In the middle of my room, there is a pillar. Its cross-section is a square with sides of 1m. I want to draw a circle of radius 2m around the pillar. Obviously I can’t get to the centre to put a compass there - how can I draw my circle accurately?

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