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The dozenth episode of @reflectivemaths (Dave Gale in real life) and @icecolbeveridge (Colin Beveridge) chatting (and/or ranting) about the maths we've seen this month.

Which includes:

- A brief discussion of dozenal
- Colin gives blood and gets woozy; Dave tried it once
- The big question: why is maths important? In which it's Dave's turn to get a touch of the Hansens, and Colin starts shilling for Teacher Training Tests For Dummies (available in all good bookshops soon)
- Google threatens Colin for broadcasting material - such as Dave's and his own voices and the jingles he made
- Misleading graphs and how @ampp3d is trying to do the Maths Police's job
- Dave gets his students drunk1 and launches Dave's Human Competence GCSE
- @njj4 (fellow new dad Nick Jackson) points out that gravitational forces of the planets when you're born are dwarfed by the gravitational effects of nearby medical staff
- Some things we like in maths: difference of two squares, complex numbers, Euclid's proof of the primes
- Loyal listener @srcav on rounding incorrectly and whether maths teachers need maths degrees, and a strong response from@miss_skinner (Sophie Skinner in real life)
- Colin disses circle theorems
- Colin shills for Teacher Training Tests For Dummies again, even though it's not out until the summer
- Question to listeners: does sport science involve any game theory?
- @christianp (Christian Perfect in real life) has created a MathsJam Voronoi diagram and we wonder if tessellations have to be regular, and how to communicate exactly how awesome that is to someone who doesn't like maths
- @aap03102 (Chris Smith in real life) has a newsletter which asks how many factors $10!$ has
- @sjsingh (Simon Singh) and his Simpsons' Mathematical Secrets
- Who is the WBU audience? Are you all teachers? Leave us comments! (We neglect to thank loyal listener @notonlyahatrack for a nice iTunes review)
- Dave's question from last time: it was 12 and a discussion of niceness in puzzles and the skill of spotting options; Colin shills a book that isn't for sale, but you can get by signing up for the Sum Comfort newsletter.
- Colin's question, stolen from @jussumchick (Jo Sibley in real life): if you cut a circle of card into two sectors and fold them into cones, what angle gives the biggest total volume?
- Colin doesn't get continued fractions. Any thoughts?
- Intradepartment segregation at university (who teaches what?) and playing Doctors and Misters (congratulations, again, to Dr @peterrowlett), the mental health issues of doing doctorates and certificate mills
- Next up: our anniversary episode! Send us nice comments and/or audio clips if you're so inclined!
- ON KNOWLEDGE [↩]

## notonlyahatrack

RT @icecolbeveridge: [FCM] Wrong, But Useful: Episode 12: http://t.co/UjWgC7nM4D

## Nanette Amanda McLeod-Johnson

Nanette Amanda McLeod-Johnson liked this on Facebook.

## reflectivemaths

NEW Wrong, But Useful: Episode 12: http://t.co/UDwf3LoBCS #mathchat #podcast

## chaotic_system_

RT @reflectivemaths: NEW Wrong, But Useful: Episode 12: http://t.co/UDwf3LoBCS #mathchat #podcast

## Chris Smith (@aap03102)

Enoyed listening to the latest episode guys!

My Twitter handle might be causing Dave consternation but I’m sticking with it…Thanks for another mention in WBU! If Google threaten you guys again I might suggest you pay them off twice. Although that might lead to “Two Rueful Bungs” (another anagram of WBU)….

## srcav

superb episode of #wbu from.@icecolbeveridge and @reflectivemaths http://t.co/HjVxNo7nnw

## snapey1979

via @srcav: superb #wbu from @icecolbeveridge & @reflectivemaths http://t.co/ms9nnb0XcJ -saw topic list & wanted to discuss nearly every one

## srcav

RT @snapey1979: via @srcav: superb #wbu from @icecolbeveridge & @reflectivemaths http://t.co/ms9nnb0XcJ -saw topic list & wanted to discuss…

## reflectivemaths

RT @srcav: superb episode of #wbu from.@icecolbeveridge and @reflectivemaths http://t.co/HjVxNo7nnw

## icecolbeveridge

I may need to publicly apologise for the puzzle in this month’s Wrong, But Useful – I blame @JusSumChick entirely. http://t.co/FolzE2JYKQ

## ColinTheMathmo

@icecolbeveridge Did you say that you don’t “get” continued fractions? Can I help?

## JusSumChick

@icecolbeveridge Ha, I immediately pass the buck to @tombutton!

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## notonlyahatrack

@icecolbeveridge I’ve got a nice(ish) solution for the volume of just 1 cone, but I’ve not made the second cone simplify yet. @JusSumChick

Pingback: Maths degrees for maths teachers? | reflectivemaths's Blog

## icecolbeveridge

.@Desmos The puzzle is from http://t.co/FolzE2JYKQ , about cutting a circle into cones.

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