Matt Parker and Bec Hill present: A Problem Squared. A podcast dedicated to solving problems of all kinds, such as, "What should I listen to right now?". A Podcast Squared. First one's free. You're welcome.

134 = Tooth and Rock Day 2026

May 10, 2026 01:21:23 13.7 MB ( 64.43 MB less) Downloads: 0

🤘To mark the May Birthday of Dwayne 'The' 'Tooth Fairy' 'Rock' Johnson, Episode 134 is a Tooth and Rock Special!

🪨 Matt answers your rock-based queries and shares a Salt of the Perth update

🦷 Bec and Dentist Sophie answer your tooth-based queries and shares an Adult Tooth Fairy update


Head to our socials to look at some incredibly detailed Salt of the Perth imagery.

And relatedly…

Lead Explained:

https://www.scottishwater.co.uk/-/media/ScottishWater/Document-Hub/Factsheets-and-Leaflets/Factsheets/100620SWFactSheet72020v5web.pdf

Thallium in Salt Substitutes: A Possible Health Hazard:

https://www.sciencedirect.com/science/article/pii/0013935177900433


And here’s Matt’s Moving Mountains sources:

https://ourworldindata.org/energy-production-consumption

https://www.eoas.ubc.ca/courses/eosc350/content/foundations/properties/density.htm


Matt has extended his tour - and filming the show in London in October - all the dates, venues and tickets can be found here:

http://standupmaths.com/shows 


Join us on Patreon for early releases and our monthly bonus podcast I’m A Wizard!

If you’re already on Patreon and have a creative Wizard offer to give Bec and Matt, please comment on our pinned post!  

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Finally, if you want even more from A Problem Squared you can connect with us and other listeners on BlueSky, Twitter, Instagram, and on Discord.