When maths marketing goes wrong.

Come see me on tour to get your mathematically dubious cereal boxes signed. https://standupmaths.com/shows You can also find me talking about other unreleased video topics at An Evening of Unnecessary Detail. https://festivalofthespokennerd.com/show/an-evening-of-unnecessary-detail/ Check out the full correspondence with Kellogg's on Reddit: https://www.reddit.com/r/theydidthemath/s/rRbfNVF4aa And MindYourDecisions video looking at the surface area problem: https://youtu.be/0qT\_h84o7JI?si=y3ALapozUGMM2kpJ The paper determining spheres are the most volume-efficient 3D shape is available here: https://www.ams.org/journals/bull/1978-84-06/S0002-9904-1978-14553-4/S0002-9904-1978-14553-4.pdf Huge thanks to my Patreon supporters. They are the delicious donut manifold that surrounds me. https://www.patreon.com/standupmaths CORRECTIONS Some parentheses float up into their index at 0:46 and 5:18. Blame the sugar high. At 8:11 I say Kellogg's don't make any loop-based cereal, but they do make Froot Loops and Apple Jacks. Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Additional filming by Truman Hanks Voiceover by Tom Crowley Written and performed by Matt Parker Content wrangling by Rhys Jones Production and cake baking by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/