In this episode, we're joined by @christianp, who is Christian Lawson-Perfect in real life, our first returning special guest co-host1. We discuss:

• The Big Internet Math Off and associated stickerbook
• 99 variations on a proof by Philip Ording
• The Art of Statistics - Learning from Data by David Spiegelhalter
• Maths on the back of an envelope - Rob Eastaway
• 1 in 8 men believe they “could” win a point against Serena Williams.
• Green number lines
• via Adam Atkinson: Zachtronics games are now free for school use. Also, "Baba is You" is fun.
• Mathematical objects podcast
• Via @peterrowlett: The Talking maths with your kids hashtag #tmwyk

1. That said, I think @draon_dodo has been involved in two previously.

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