We calculated pi with colliding blocks

Happy Pi Day 2025 everyone! Check out Grant's new 3blue1brown video: https://youtu.be/6dTyOl1fmDo?si=k0az9B4pEOnRXbIh Oh look, it's Steve's excellent channel: https://www.youtube.com/stevemould Sign up for future pi-by-hand videos: https://forms.gle/w44THpNJ3jWUPqHy6 Massive thanks to Hugh Hunt and everyone in the University of Cambridge Department of Engineering, particularly the legends in the workshop. https://www.eng.cam.ac.uk/profiles/hemh1 Huge thanks to my Patreon supporters. They keep my masses bouncing back and forth. https://www.patreon.com/standupmaths CORRECTIONS - At 22:27 I say the Bonn ratio was 1-to-97 but they double checked for me and it was actually 1-to-93, which makes the same point. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Extra material by Grant Sanderson Extra something from Steve Mould Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician