video thumbnail 25:24
New 7-direction pencil model discovered!

2024-05-31

[public] 135K views, 10.8K likes, dislikes audio only

channel thumbStand-up Maths
4K

Find out more about Jane Street’s programmes running across the world:

https://bit.ly/sum-janestreet-programs

Including the WiSE course which is open to self-identifying women and gender-expansive university students and incoming students: https://www.janestreet.com/join-jane-street/programs-and-events/wise/

Check out KangarooPhysics’ original gif showing the cross-section through the packing arrangment: https://x.com/kangaroophysics/status/1491858072251342850?s=46&t=EVDbN01K_p7T27Gd23R0bw

And Daniel Piker’s amazing 3D model: https://sketchfab.com/3d-models/rod-packing-7directions-2-e56a6e899b2b4ef4bb458c66343363e4

More detail on rod packing in this paper: https://journals.iucr.org/paper?S010876730001151X

If you want to watch the extended cut, with every excruciating, pencil-pushing moment included, head over to this video on the second channel: https://www.youtube.com/watch?v=EsBqeGtThW8

You can also watch the original "How to build a Hexastix in 72 easy steps" if you just want to build a Hexastix. In 72 easy steps. /youtube/video/DelH1S32dOg

If you need 85 custom pencils in your life (The 67 you need, plus we've put in a few spares) you can buy a set over on Maths Gear. Elastic bands are not included.

https://mathsgear.co.uk/products/prism-pencils-pack-of-85

Huge thanks to my Patreon supporters. They are as special as a triangular pencil. https://www.patreon.com/standupmaths

CORRECTIONS

- None yet, let me know if you spot anything!

Filming and editing by Alex Genn-Bash

Written and performed by Matt Parker

Produced by Nicole Jacobus

Music by Howard Carter

Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician

Website: http://standupmaths.com/

Love Triangle: https://mathsgear.co.uk/products/love-triangle-by-matt-

parker-signed

All UK options: https://www.penguin.co.uk/books/443151/love-triangle-by-parker-matt/9780241505694

All USA options: https://bit.ly/3wCTesR


Stand-up Maths I do mathematics and stand-up. Sometimes simultaneously. Occasionally while being filmed. (It's quite the Venn diagram.) Principle channel supporter: Jane Street https://www.janestreet.com/ http://standupmaths.com http://twitter.com/standupmaths https://m.bilibili.com/space/475271755
/youtube/channel/UCSju5G2aFaWMqn-_0YBtq5A
The mathematically impossible ball that shouldn’t exist. 259,372 views
/youtube/video/_cAl3FlQZ9Q
Love Triangle by Matt Parker (signed) mathsgear.co.uk
https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed